Answer:
Average acceleration of the car is 1.167 m/s^2
Explanation:
The speed of car with which it is travelling is 12 m/s
As the driver accelerates the car, the speed reaches 26 m/s
The change in speed in 12 seconds is
26 -12 = 14 m/s
Average acceleration is change in speed divided by time
[tex]\frac{14}{12} \\1.167[/tex] m/s^2
Which energy change is caused by an endothermic chemical reaction?
A. An increase in temperature
B. Absorption of thermal energy
C. Release of light
D. Production of thermal energy
The energy change caused by an endothermic chemical reaction is the absorption of thermal energy. So, option B.
What is meant by endothermic reaction ?Endothermic reactions are defined as, those reactions in which the reactants take in heat energy from the environment to create products.
Here,
The endothermic reactions lower the temperature of their surrounding area, thereby creating a cooling effect.
When bonds in the reactants are broken, more energy is absorbed than is released when new bonds are generated in the products. This is known as an endothermic reaction.
A drop in the temperature of the reaction mixture is a characteristic of endothermic reactions.
In endothermic reactions, the enthalpy of the products of the reaction is greater than that of the reactants. Energy is absorbed from the surroundings.
Hence,
The energy change caused by an endothermic chemical reaction is the absorption of thermal energy.
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a measuring cylinder contains water when put rock level rises what is volume of rock
Answer:
The volume displacement resulting from the action, minus the original volume.
Which of the following is the combination that is used in the formation of achromatic lenses?
1 point
1 convex and 1 plane mirror
2 convex lenses
1 convex and 1 concave lens
2 concave lenses
Answer:
convex and 1 plane mirror
A hockey puck slides with a constant velocity across a frictionless ice surface. In one paragraph, using your own words, describe the net force on the hockey puck and the observation which allowed you to draw that conclusion.
Answer:
The net force on the hockey puck is zero because it's acceleration is zero due to constant velocity.
The hockey will remain in it's uniform motion unless compelled by an external force.
Explanation:
[tex]from \: vector \: mechanics \\ a = \frac{dv}{dt} \\ but \: at \: constant \: velocity \\ \frac{dv}{dt} = 0 \\ hence : \: \: a = \frac{0}{dt} \\ a = 0[/tex]
If a cheetah runs 352 meters in 20 seconds, what is the speed of the cheetah?
Answer:
63360 mi/h
Explanation:
How to find the speed of an object
Calculate speed, distance, or time using the formula d = st, distance equals speed times time. The Speed Distance Time Calculator can solve for the unknown SDT value given two known values.
Time can be entered or solved for in units of second S (s), minutes (min), hours (hr), or hours and minutes and seconds (hh:mm: ss). See shortcuts for time formats below.
To solve for distance use the formula for distance D = st, or distance equals speed times time.
distance = speed x time
Rate and speed are similar since they both represent some distance per unit time like miles per hour or kilometers per hour. If rate r is the same as speed s, r = s = d/t. You can use the equivalent formula d = rt which means distance equals rate times time.
distance = rate x time
To solve for speed or rate use the formula for speed, s = d/t which means speed equals distance divided by time.
speed = distance/time
To solve for time use the formula for time, t = d/s which means time equals distance divided by speed.
time = distance/speed
Therefore, the speed = 63360 miles per hour
= 63360 mi/h
An electric iron consumes energy at a rate of 840 W when heating is at the maximum rate and 360 W when the heating is at the minimum. The voltage is 220 V. What are the current and the resistance in each case?
Don't spam
Answer:
At maximum the current is 4A and resistance is 55Ω
At minimum the current is 1.636A and resistance is 134.45Ω
Explanation:
The computation of the current and the resistance in each case is shown below:
At the time when it is heated at max rate,
power, P = 840W
V = 220V
As We know that
P = VI
840 = 220 × I
I = 840 ÷ 220
I = 4 A
Now
R = V ÷ I
= 220 ÷4
= 55 Ω
Hence, the current is 4A and resistance is 55Ω
At the time When it is heated at minimum rate,
power, P = 360W
V = 220V
As We know that
P = VI
360 = 220 × I
I = 360 ÷ 220
I = 1.636 A
Now
R = V÷ I
= 220 ÷1.636
= 134.45 Ω
Hence, the current is 1.636A and resistance is 134.45Ω
A car travels in 300 km in 3 hours. What can be determined?
Answer: If a car travels 300 km in 3 hours, then it’s speed will will be 100 km/hr. But in practical it depends upon type of car, condition of car, car's maximum speed and also the path in which car is travelling.. Because car can't travel in constant speed of 100 km/hr. So, if car have 120 km/hr as maximum speed than it's minimum speed will be 85–95 km/hr. And so the car travel 300 km in around 5 or 5 and half hours.
given the atomic number,how would you know the number of protons?
A block is attached to the end of a horizontal ideal spring and rests on a frictionless surface. The block is pulled so that the spring stretches relative to its unstrained length. In each of the following three cases, the spring is stretched initially by the same amount. Rank the amplitudes of the resulting simple harmonic motion in decreasing order (largest first). (a) The block is released from rest. (b) The block is given an initial speed . (c) The block is given an initial speed .
Answer:
The answer is "a, c and b"
Explanation:
Its total block power is equal to the amount of potential energy and kinetic energy.Because the original block expansion in all situations will be the same, its potential power in all cases is the same.Because the block in the first case has no initial speed, the block has zero film energy.For both the second example, it also has the [tex]v_o[/tex] velocity, but the kinetic energy is higher among the three because its potential and kinetic energy are higher.While over the last case the kinetic speed is greater and lower than in the first case, the total energy is also higher than the first lower than that of the second.The greater the amplitude was its greater the total energy, therefore lower the second, during the first case the higher the amplitude.Please help!!!!! This is for science and I don’t understand
Answer:
the correct one is B
Explanation:
In this exercise, indicate that crocodiles need a warm climate to survive.
The current climate in the western Colorado region where the temperature is 53ºF (11.7ºC) does not allow them to survive, therefore the appearance of fossil crocodiles and fossil subtropical plants and a clear indication that the climate in these regions was much more warm
when checking the answers the correct one is B
Pls help meh Kdjdjeidjndiejdididjdjjdidjdjdiejd
Answer:
i think b
Explanation:
i'm not sure
Answer:
I think both pure substance and an element .
hope it is helpful to you ☺️☺️
Which is not a typical property of an acid?
A They react with alkalis producing water.
B They react with all metals producing hydrogen.
C They react with carbonates producing carbon dioxide.
D They turn litmus paper red.
Answer:
B They react with all metals producing hydrogen.
Which is not a typical property of an acid?
A They react with alkalis producing water.
B They react with all metals producing hydrogen.
C They react with carbonates producing carbon dioxide.
D They turn litmus paper red.
Answer:
the answer is D acid don't turn paper red.
The one that is not a typical property of an acid is they react with all metals producing hydrogen. The correct option is D.
What is an acid?A substance that reacts with certain metals to produce salts and releases hydrogen ions into water.
Acids give certain dyes a reddish tint and have a sour flavour. Some body-produced acids, such as stomach acid, can support organ function. Hydrochloric acid is a kind of acid.
Acids and many metals, although not all, interact. As the metal combines with the acid to create a salt, hydrogen gas is created.
Acids and many metals, although not all, interact. As the metal combines with the acid to produce a salt, hydrogen gas is created.
The fact that acids react with all metals to produce hydrogen is the only characteristic of an acid that is unusual.
Thus, the correct option is D.
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A bat produces a sound at 17,250Hz and wavelength 0.019m. What is
the speed of the sound?
Explanation:
v = f × /\
v = 17250 × 0.019
v = 327.75ms²
A produces a sound at a frequency of 17,250 Hz and wavelength of 0.079 m then the speed of sound will be equal to 327.75 m/s².
What is Wavelength?The distance between two identical locations (adjacent crests) in successive cycles is known as the wavelength, and it is used to describe waveform signals that are transmitted over wires or into space. Typically, in wireless systems, this length is specified in meters (m), centimeters (cm), or millimeters (mm). The wavelength is more frequently described in nanometers (nm), which are units of 10⁻⁹ m, or angstroms, which are units of 10⁻¹⁰ m, for infrared (IR), visible light (UV), and gamma radiation.
As per the given information in the question,
Frequency, f = 17,250 Hz
The wavelength λ = 0.019 m
Then the speed of the sound (v) will be,
v = f × λ
v = 17250 × 0.019
v = 327.75 m/s²
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The momentum of a car traveling in a straight line at 20 m/s is 24,500 kg•m/s. What is the cars mass?
Answer:
p=mv
p=given=24500kg-m/sec
m=?
v=20m/sec
m=p/v
=24500kg-m/sec÷20m/sec
=1225kg=ans
Answer:
1225kg=ans
Explanation:
can you please help me with this lab.
Answer: I really don’t know
Explanation:
A researcher is trying to identify whether household substances are basic. Which approach would BEST help the researcher
investigate whether substances are basic?
A. Test each substance with red litmus paper.
B. Test each substance with blue litmus paper.
C. Observe each substance and record its color.
D. Mix each substance with a weak base and record the results.
Answer:
a
Explanation:
because red litmus paper turn blues under base or alkaline condition
What is the galaxy that our solar system is located in?
Answer:
I think the answer is Milky Way
I hope this Will help you
A force is used to lift mass to a height of 8 m does 1040 J of work. How much force is used?
Answer:
[tex]\boxed {\boxed {\sf 130 \ Newtons }}[/tex]
Explanation:
Work is the energy transferred to or from an object when force is applied to cause displacement. It is the product of force and displacement.
[tex]W=F*s[/tex]
The displacement (s) is 8 meters and the work (W) is 1,040 Joules. Substitute these values into the formula.
[tex]1040 \ J= F* 8 \ m[/tex]
First, let's convert the units. This will make the question easier later on. 1 Joule is equal to 1 Newton meter, so the 1040 J of work equal 1040 N*m.
[tex]1040 \ N*m= F * 8 \ m[/tex]
Since we are solving for the force (F), we must isolate the variable. It is being multiplied by 8 meters and the inverse of multiplication is division. Divide both sides by 8 m.
[tex]\frac {1040 \ N*m}{8 \ m}= \frac{F * 8 \ m}{8 \ m}[/tex]
[tex]\frac {1040 \ N*m}{8 \ m}=F[/tex]
The meters cancel out, hence our earlier unit conversion.
[tex]130 \ N = F[/tex]
A force of 130 Newtons is used.
14. Earth goes around the sun at an astonishing speed of about -hold your breath-107 460 643 meters per second. *
1 point
True
False
15. A car is moving around an oval track at a constant speed of 20km/h. Is it accelerating? *
1 point
True
False
Answer: 14 speed of Earth around Sun I see 30 km/s. FALSE
15. Because car is in circle track, direction of velocity changes
And car is in accelerating motion. direction of acceleration points to
The centre of the circle. RIGHT
Explanation:
Pedro y Juan van a la escuela en bicicleta. Pedro vive a 5 km de distancia al este de la escuela, y Juan al oeste es decir -4 km. Si ambos hicieron un tiempo de 0.25 horas. Cuál es la velocidad de cada uno?
Answer:
Lo primero que hay que recordar es la relación:
Velocidad = Distancia/tiempo.
Para el caso de Pedro, el vive a 5km de la escuela (es decir, para llegar a la escuela, el debe recorrer -5km, entonces la distancia es -5km), y recorre esa distancia en 0.25 horas, entonces su velocidad es:
Velocidad = -5km/0.25hr = -20km/h
Esto significa que Pedro se mueve con una velocidad de -20km/h, lo que significa que se mueve hacia el oeste con un módulo de 20km/h
Para el caso de Juan, el vive a -4km de la escuela, entonces el tendrá que recorrer 4km para llegar a la escuela, y los recorre en 0.25 horas, entonces su velocidad sera:
Velocidad = 4km/0.25h = 16 km/h
Lo que significa que Juan tiene una velocidad de 16km/h hacia el este.
Air resistance is the result of collisions of the object’s total surface area with air molecules. True or False
A.
TRUE
B.
FALSE
Answer:
true
Explanation:
GIVING BRAINLIEST PLEASE HELP!!
-if you answer correctly ill give you brainliest which will give you 20pts-
Explanation:
the other 40% is used to power the 60% making it only capable of 60% efficiency
Someone please help me figure this out
Answer:
The third one is correst
Suppose a new element with atomic number 120 is discovered.If some isotopes of this element have 122 neutrons and some have 124 neutrons,what can you infer about the atomic mass of the element?Explain you answer.
Answer:
I assume you are referring to the standard atomic weight of the elements when you write atomic mass. No elements beyond uranium has a standard atomic weight. The reason is explained by the organization assigned responsibility for the assignment of standard atomic weights,the international Union of Pure and Applied Chemistry commission on isotopic abundances and atomic weights.
where is the center of the universe located? and any 16 or older guys on here who are down to talk?? i got a pad we can talk on :) (i'm 17)
Answer:
the center of the universe is in your mom's stomach. why do I keep seeing people wanting to look for a date. the f. u. c. k.?
CAN PEOPLE PLEASE HELP, I NEED TO GET TO THE NEXT LEVEL OR WHATEVER ITS CALLED BUT I NEED 5 BRAINLIEST IN 2 DAYS, I ALREADY HAVE 7 BUT THAT DOSENT COUNT IG, IF YOU HELP ILL RETURN THE FAVOR AND GIVE YOU BRAINLIEST ON YOUR AWENSERS OR QUESTIONS........ ILL AWENSER ONE OF YOUR QUESTIONS AND YOU MAKE ME BRAINLIEST? THXX
Answer:
answer the question i have asked go to my account
Explanation:
can i get brainliest
Answer:
yes you can go on your account
What is the purpose of chloroplasts, and why do you think it is missing from the root hair cell?
Explanation:
Mitochondria are essential parts of many eukaryotes, but they are useless without oxygen. Therefore, chloroplasts are extremely important. They produce breathable air for life. Root hairs are seen to not have chloroplasts as their job is to collect water and nutrients.
BRAINILIEST PLEASEHURRY URGENT ASAP I WILL GIVE BRAINLIEST
What does mutate mean?
a)Change the DNA of your cells
b) Kill your DNA
c)Kill your cell
d)Change the cell
Answer:
A
Explanation:
1.El diámetro del Universo visible es 8,8 x10^26 m El volumen del Universo visible se calcula usando 4/3 Pi radio^3. La densidad del universo visible es 9.9 x 10^-27 Kg/m^3 Calcule la cantidad de materia que hay en el Universo. Use la fórmula Densidad x Volumen = Masa Exprese su respuesta en Kg 2.La masa del sol es 2x10^30 Kg. ¿Cuántas masas solares se necesitan para completar la masa total del universo visible? Exprese su respuesta en gramos
Answer:
1. La cantidad de materia que hay en el Universo es 3,53x10⁵⁴ kg.
2. Se necesitan 1,8x10²⁴ masas solares para completar la masa total del Universo visible.
Explanation:
1. La cantidad de materia del Universo se puede calcular a través de su volumen (V) y de su densidad (d):
[tex] d = \frac{m_{u}}{V} = \frac{m}{\frac{4}{3}\pi r^{3}} [/tex]
En donde:
r: es el radio = d/2 = 8,8x10²⁶/2 m = 4,4x10²⁶ m
[tex]m_{u}[/tex]: es la masa del Universo =?
d: es la densidad = 9,9x10⁻²⁷ kg/m³
[tex]m_{u} = d*v = 9,9 \cdot 10^{-27} kg/m^{3}*\frac{4}{3}\pi (4,4 \cdot 10^{26} m)^{3} = 3,53 \cdot 10^{54} kg[/tex]
Entonces, la cantidad de materia que hay en el Universo es 3,53x10⁵⁴ kg.
2. La masa del sol es 2x10³⁰ kg, por lo que para completar la masa total del Universo visible se necesitan las siguientes masas solares:
[tex]N = \frac{m_{u}}{m_{s}} = \frac{3,53 \cdot 10^{54} kg}{2\cdot 10^{30} kg} = 1,8 \cdot 10^{24}[/tex]
Por lo tanto, se necesitan 1,8x10²⁴ masas solares para completar la masa total del Universo visible.
Espero que te sea de utilidad!