Answer:
False
Explanation:
In the linear equation y = mx + b, b is the y-intercept and mx is the slope.
the angle between the incident ray and the reflected ray is 800. what is the angle of incidence
Answer:
50 degrees
Explanation:
the angle between the incident ray and the reflected ray is 80 degrees
80 degrees + inc + refl = 180
inc = refl = 50 degrees
How will the force of friction affect a wood block being pushed over a table?
A. Friction acts in the direction of motion, speeding the block up.
B. Friction acts in the direction of motion and is included in the moving force.
C. Friction acts in the opposite direction of motion but does not affect the motion of the object.
D.Friction acts in the opposite direction of motion, slowing the block down.
Answer:
D
friction acts in the opposite direction of motion but does not affect the motion of the object
Answer:D.Friction acts in the opposite direction of motion, slowing the block down.
Explanation:
Why does a balloon shrink in cold water?
Answer:
The balloon shrank because the average kinetic energy of the gas molecules in a balloon decreases when the temperature decreases. This makes the molecules move more slowly and have less frequent and weaker collisions with the inside wall of the balloon, which causes the balloon to shrink a little.
Explanation:
Not only does it shrink in cold water but it shrinks in the cold itself.
Hope this helps!!
Parallel light rays are refracted _______and_____ to a point called as focal point after passing through convex lens.
What is the period of a wave that has a frequency of 300 hz?
Answer:
T = 0.003 s
(Period is written as T)
Explanation:
Period = time it takes for one wave to pass (measured in seconds)
frequency = number of cycles that occur in 1 second
(measured in Hz / hertz / 1 second)
Period : T
frequency : f
So, if we know that the frequency of a wave is 300 Hz, we can find the period of the wave from the relation between frequency and period
T = [tex]\frac{1}{f}[/tex] f = [tex]\frac{1}{T}[/tex]
to find the period (T) of this wave, we need to plug in the frequency (f) of 300
T = [tex]\frac{1}{300}[/tex]
T = 0.00333333333
So, the period of a wave that has a frequency of 300 Hz is 0.003 s
[the period/T of this wave is 0.003 s]
Suppose x and y are distances of object and image respectively from a mirror. What shall be be the shape of the graph between 1/x and 1/y for a concave mirror ?
Answer:
The shape of the graph would be a circle
Explanation:
Because the mirror is concave , which it's inner part will be curved.
Calculate the work done by a bulldozer of power 5000W in 15 seconds
[tex]\text{Work done,}~W = Pt \\\\~~~~~~~~~~~~~~~~~~~~=5000~W \times 15 ~s\\\\~~~~~~~~~~~~~~~~~~~~=75000~ J[/tex]
Answer:
75kJ
Explanation:
Formula :
Work done = Power × Time
===========================================================
Given :
⇒ Power = 5000 W = 5kW
⇒ Time = 15 seconds
=============================================================
Solving :
⇒ Work done = 5kW × 15s
⇒ Work done = 75kJ
Two identically-sized metal spheres on insulating
stands are positioned as shown below. The
charge on sphere A is −4.0 × 10−6 coulomb and
the charge on sphere B is −8.0 × 10−6 coulomb.
The two spheres are touched together and then
separated. The total number of excess electrons
on sphere A after the separation is
Answer:
-6 x 10^-6 C
Explanation:
The two spheres will equilibrate to the same charge on each
-6 x 10^-6 C
The two spheres are touched together and then separated. The total number of excess electrons on sphere A is 3.75×10¹³ electrons after the separation.
What is electric charge ?Electric charge is the physical property of matter that experiences force when it is placed in electric field. F = qE where q is amount of charge, E = electric field and F = is force experienced by the charge. there are two types of charges, positive charge and negative charge which are generally carried by proton and electron resp. like charges repel each other and unlike charges attract each other. the flow charges is called as current. Elementary charge is amount of charge a electron is having, whose value is 1.602 x 10⁻¹⁹ C.
When the spheres touch together, they obtain equal charges. Since the spheres are same in dimension, they obtain equal charges.
Given,
q₁ = −4.0 × 10⁻⁶ C
q₂ = −8.0 × 10⁻⁶ C
q₁ + q₂ = −4.0 × 10⁻⁶ C + −8.0 × 10⁻⁶ C = -12.0 × 10⁻⁶ C
When two charged spheres touch together, they will have equal amount of charge. Means there attain equilibrium of charge.
Hence each charged sphere will have -6.0 × 10⁻⁶ C of charge.
The number of excess electrons on both the spheres will be,
(6.0 × 10⁻⁶ C) ÷ (1.6 × 10⁻¹⁹C) = 3.75 × 10¹³
The number 1.6 × 10⁻¹⁹C is called as Elementary charge.
Hence the number of excess electrons on Sphere A is 3.75 × 10¹³.
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Individuals should participate in activities __________ to improve cardiovascular fitness.
A.
twice a day
B.
three to five days a week
C.
two to three days a week
D.
seven days a week
HURRY!!
Individuals should participate in activities three to five days a week to improve cardiovascular fitness.
What is cardiovascular fitness?Cardiovascular fitness is a measure of how well ones body can take in oxygen and deliver it to muscles and organs during prolonged periods of exercise.
A person is considered cardiovascular fit if they can exercise for a long period of time without getting unduly tired.
Examples of cardiovascular exercises are;
swimmingcyclinghikingHowever, individuals should participate in activities three to five days a week to improve cardiovascular fitness.
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the pieces of ice float on water why
they float on water because the ice has the same mass of water and is density is lighter
What mindset do you believe Einstein had while alive and what do you think the key component or constant action was for Einstein throughout his "miracle year"
Albert Einstein had a growth mindset due to innovative nature.
What mindset do you believe Einstein had?Albert Einstein had a growth mindset because he did not give up when he face failure. He was very good in math and science but did not get into the school. The reason behind is that Einstein is different from other students. The key component or constant action was focus and devotion to work for Einstein throughout his "miracle year".
So we can conclude that Albert Einstein had a growth mindset due to innovative nature.
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One of the functional characteristics of life is excitability or responsiveness. This refers to ________.
Excitability or responsiveness can be referred to as Sensitivity to the environment
Meaning of Excitability or responsivenessExcitability or responsiveness can be defined as an ability possessed by living things that helps them react to the environment according to the vibe or energy they sense.
In conclusion, Excitability or responsiveness can be referred to as Sensitivity to the environment
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Three resistors are connected in parallel. If placed in a circuit with a 12-volt power supply. Determine the equivalent resistance (rounded to the nearest hundredth), the total circuit current (rounded to the nearest hundredth), and the voltage drop across and current in each resistor (round to the nearest hundredth).
(a) The equivalent resistance of three parallel resistors is (R₁R₂R₃)/(R₁R₂ + R₁R₃ + R₂R₃).
(b) The total circuit current is 12/R.eq.
(c) The voltage drop across and current in each resistor is IR₁, IR₂ and IR₃.
Equivalent resistance of three parallel resistors
The equivalent resistance of three parallel resistors is calculated as follows;
Let the first resistor = R₁Let the second resistor = R₂Let the third resistor = R₃[tex]\frac{1}{R_{eq}} = \frac{1}{R_1} + \frac{1}{R_2} + \frac{1}{R_2}\\\\R_{eq} = \frac{R_1R_2R_3}{R_1R_2 + R_2R_3 + R_1R_3}[/tex]
Total Circuit CurrentThe total circuit current is calculated as follows;
V = IR
[tex]I= \frac{V}{R_{eq}} = \frac{12 \ V}{R_{eq}}[/tex]
Voltage drop in each resistorVoltage drop in resistor 1 = IR₁
Voltage drop in resistor 2 = IR₂
Voltage drop in resistor 3 = IR₃
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An object is moving across a surface, but it does not gain or lose speed. Which best describes the object’s force?
The net force is positive.
The net force is zero.
The positive force is greater than the negative force.
The negative force is greater than the positive force.
The statement best describes the object's force is the net force is zero.
What is Net force?When two or more forces are acting on the system of objects, then the to attain equilibrium, net force must be zero.
An object is moving across a surface, but it does not gain or lose speed. This means that the body is moving with constant velocity. The constant velocity indicates that the acceleration is zero.
Thus, the net force is zero.
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As a person moves down a zip wire her increase in kinetic energy is less than her decrease in gravitational potential energy explain why?
Air resistance causing thermal energy to be transferred to surroundings is why her increase in kinetic energy is less than her decrease in gravitational potential energy.
What is Thermal energy?This is also known as heat energy and is measured to ascertain the temperature of a substance.
Air resistance brings about loss of heat to the environment and the increase in kinetic energy being less.
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When a wire with an electric current i is placed in a magnetic field of strength b it experiences a magnetic force f. What is the direction of f?
The direction of force, when electric current and magnetic field direction given is at 90° to the plane containing current I and Magnetic field B.
What is magnetic force?The force of attraction or repulsion experienced by a magnetic material when it enters the magnetic field.
When a wire with an electric current I is placed in a magnetic field of strength B it experiences a magnetic force F.
According to the Fleming's right hand rule, the direction can be determined by knowing any two parameter's direction.
Thus, The direction of force is at 90° to the plane containing current I and Magnetic field B.
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. The nucleus contains protons and neutrons and the outer part of the atom contains
Answer:
Electrons
What are electrons?An elementary particle that is a fundamental constituent of matter, having a negative charge of 1.602 × 10- 19 coulombs, a mass of 9.108 × 10 - 31 kilograms, and spin of 1/2, and existing independently or as the component outside the nucleus of an atom. It can also be defined as a unit of charge equal to the charge of one electron.
Explain any two factors that affect the pressure at a point inside a liquid
Answer:
The depth of that point from the surface. The density of the liquid. Acceleration due to gravity.Mark as brainlest answer ¯\_(☯-☯)_/¯A spinning satellite begins to unfold two solar panels as shown. How does a satellites ANGULAR MOMENTUM change as its panels extend?
A. It drops to zero.
B. It decreases.
C. It remains constant.
D. It increases.
As the satellite panels extend, the angular velocity decreases due to drag force, and hence it will cause a decrease in the angular momentum of the satellite.
What is angular momentum?
Angular momentum is defined as the quantity of rotation of a body, which is the product of mass, velocity and radius.
L = mvr
L = mωr²
where;
m is mass of the objectv is velocityr is radius ω is angular velocityAs the satellite panels extend, the angular velocity decreases due to drag force, and hence it will cause a decrease in the angular momentum of the satellite.
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Three things you learned about waves. Three things you learned about sound. Three things you learned about light.
Answer:
stuff
Explanation:
1. Waves have different wavelengths
2. Waves are in the ocean
3. Waves can make radio
Sound
1. Sound makes you hear
2. Sound is slower than light
3. There is No sound in space
Light
1. There are many types of light
2. Such as infrared, UV, Microwave
3. Light is the fastest thing in the universe
4. Light cannot escape a black hole
What is the potential energy of a 25 kg bicycle resting at the top of a hill 3 m high (formula:pe=mgh)
The potential energy of a 25 kg bicycle resting at the top of a hill 3 m high will be 735.75 J.
What is potential energy?
The potential energy is due to the virtue of the position and the height. The unit for the potential energy is the joule.
The potential energy is mainly depending upon the height of the object. when the cyclist is at the highest position, the height is maximum. Therefore, the potential energy is also maximum.
The potential energy is found as;
PE=mgh
PE=25 kg× 9.81 m/s² ×3 m
PE= 735.75 J.
Hence, the potential energy of a 25 kg bicycle resting at the top of a hill 3 m high will be 735.75 J.
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please help Which graph shows the change in velocity of an object in free fall?
The graph that shows the change in velocity of an object in free fall is graph B.
What is velocity?Velocity is the speed of a body in a specified direction.
It is also defined as the ratio of displacement and tome.
Velocity is a vector quantity.
The change in velocity of a body is known as acceleration.
The velocity of a body undergoing free fall increases by a constant value given as by the acceleration due to gravity.
The graph which depicts this change in velocity is B.
Therefore, the graph that shows the change in velocity of an object in free fall is graph B.
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1. can a species' niche be influenced by interspecific competition?
No, a species niche cannot be influenced by interspecific competition. Details about niche can be found below.
What is a niche?The niche of an organism in an ecosystem refers to the function within an ecological system to which an organism is especially suited.
Interspecific competition is the competition for resources between species of different organisms.
Niche of an organism is specific to that organism and this enables it avoid competition for resources in the environment.
This suggests that a species niche cannot be influenced by interspecific competition.
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A TXV with a ______ charge bulb, sometimes referred to as a critical charge bulb, is often called a maximum operating pressure (MOP) valve.
A TXV with a vapor charge bulb, sometimes referred to as a critical charge bulb, is often called a maximum operating pressure (MOP) valve.
What is vapor charge bulb?Vapor charge bulb is a charge in a thermostatic expansion valve bulb that boils to a complete vapor. When this point is attained, an increase in temperature will not have any effect on pressure.
The complete evaporation of liquid take place. So, it is also called the critical charge bulb.
Thus, A TXV with a vapor charge bulb, sometimes referred to as a critical charge bulb, is often called a maximum operating pressure (MOP) valve.
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A 91.0-kg hockey player is skating on ice at 5.50 m/s. another hockey player of equal mass, moving at 8.1 m/s in the
same direction, hits him from behind. they slide off together.
a. what are the total mechanical energy and momentum of the system before the collision?
b. what is the velocity of the two hockey players after the collision?
The momentum before the collision velocity after the collision will be 1237.6 kg m/s² and 6.8 m/sec.
What is the law of conservation of momentum?According to the law of conservation of momentum, the momentum of the body before the collision is always equal to the momentum of the body after the collision.
The given data in the problem is;
(m₁) is the mass of hockey player 1= 91.0-kg
(m₂) is the mass of hockey player 2= 91.0-kg
(u₁) is the velocity before collision of hockey player 1 = 5.50 m/s.
(u₂) is the velocity before the collision of hockey player 2=?
a)
Momentum before the collision;
[tex]\rm m_1u_1 + m_2u_2 \\\\ 91.0 \times 5.50 + 91.0 \times 8.1 \\\\ 1237.6 kg m/s^2[/tex]
Momentum before the collision = 1237.6 kg m/s².
b)
The velocity of the two hockey players after the collision from the law of conservation of the momentum as:
Momentum before collision = Momentum after the collision
1237.6 kg m/s² = (m₁+m₂)V
1237.6 kg m/s² =(2 ×91.0-kg )V
V=6.8 m/sec.
Hence, momentum before the collision velocity after the collision will be 1237.6 kg m/s² and 6.8 m/sec.
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A 75,000-watt radio station transmits at 88 MHz. Determine the number of joules transmitted per second. 88 J/s 8800 J/s 2,000,000 J/s 75,000 J/s
Answer:
the first one is the correct answer
When an atom changes by alpha decay, its atomic number
When an atom changes by alpha decay, its atomic number decreases because of the losing of proton and neutron.
What changes occur when alpha decay occur?An alpha particles is a helium nucleus that contains 2 protons and 2 neutrons. When the alpha decay occur, the atom loses an alpha particle which causes the loss of proton and neutron thus decreases the mass number as well as atomic number occur.
So we can conclude that When an atom changes by alpha decay, its atomic number decreases because of the losing of proton and neutron.
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A car and an SUV both hit a patch of ice while driving eastbound down the road. The 1200-kg car was moving at 5 m/s when the 2600-kg SUV hit it from behind at a speed of 12 m/s. Upon impact, the car veers off the side of the road at a speed of 10 m/s. The SUV continues forward at its new velocity. Calculate the final speed of the SUV.
Velocity: _ m/s
The final speed of the SUV given the data from the question is 9.79 m/s
Data obtained from the questionMass of car (m₁) = 1200 KgVelocity of car (v₁) = 5 m/sMass of SUV (m₂) = 2600 KgVelocity of SUV (v₂) = 12 m/sFinal velocity (v) =?How to determine the final velocity of SUVFrom conservative of linear momentum,
momentum before impart = momentum after impart
m₁v₁ + m₂v₂ = v(m₁ + m₂)
Thus, we shall determine the final velocity of the SUV by obtaining the velocity after impart. This can be obtained as follow:
v = (m₁v₁ + m₂v₂) / (m₁ + m₂)
v = [(1200 × 5) + (2600 × 12)] / (1200 + 2600)
v = [(6000 + 31200)] / 3800
v = 37200 / 3800
v = 9.79 m/s
Thus, the final velocity of the SUV is 9.79 m/s
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You want to go jogging at a nearby park. your mother says a thunderstorm is five miles away. the safest thing to do in this situation is to
bring your cell phone for emergencies
find an indoor place to exercise
go jogging quickly before the storm comes
wear a poncho while jogging
Answer:
"find an indoor place to exercise"
I think that golf courses call in the golfers if there is a lightning strike within 5 miles of the golf course sensor.
Who collected the evidence to prove what quasars are?
*
1 point
Inh Jee
Fred Hoyle
Albert Einstein
Maarten Schmidt
Answer:
I believe the answer is Maarteb Schmidt as he's the one who discovered quasars.