Einstein's theory of general relativity is currently the best explanation of gravity.Why has this theory not been replaced with a new one

Answer:

A  75.1 N and a direction of 152° to the vertical.

B 85.0 N at 0° to the vertical.

Explanation:

A) The interaction partner of this normal force has what magnitude and direction?

The interaction partner of this normal force is the component of the weight of the crate perpendicular to the ramp. It has a magnitude of 85cos28° = 75.1 N and a direction of 180° - 28° = 152° to the vertical(since it is directed downwards perpendicular to the ramp).

B) The normal and frictional forces are perpendicular components of the contact force exerted on the crate by the ramp. What is the magnitude and direction of the contact force?

Since this force has to balance the weight of the crate, its magnitude is 85.0 N. Its direction has to be vertically opposite to that of the weight.

Since the weight is 180° to the vertical (since it is directed downwards), this force is 0° to the vertical.

So, this force has a magnitude of 85.0 N and a direction of 0° to the vertical.

Given :

A 10.-kilogram object falls freely for a distance of 6.0 meters near Earth's

surface.

To Find :

The total kinetic energy gained by  the object as it falls.

Solution :

Since, only conservative force i.e gravity is applied on the object.

So, its total energy is constant.

Total kinetic energy gained = Total potential energy gained

K.E = mgh ( Here, g is acceleration due to gravity  = 9.8 m/s² )

K.E = 10 × 9.8 × 6 J

K.E = 588 J

Hence, this is the required solution.

The kinetic energy of an object is proportional to the product of its mass and the square of the velocity of the object.

The kinetic energy of the object is 588 J. Option B shows the kinetic energy of the object.

The kinetic energy of an object is defined as the energy that it possesses due to the motion of the object.

Given that the mass m of the object is 10 kg and it falls from the height h of 6 meters near the earth's surface. The object falls vertically, so the gravitational acceleration is applied to it.

The potential energy of the object is given below.

[tex]PE = mgh[/tex]

[tex]PE = 10 \times 9.8 \times 6[/tex]

[tex]PE = 588 \;\rm J[/tex]

The total force applied to the object is due to gravity only. Hence the total energy of the object will be constant. Thus the kinetic energy of the object will be equivalent to the potential energy of the object.

Hence we can conclude that the kinetic energy of the object is 588 J. Option B shows the kinetic energy of the object.

To know more about kinetic energy, follow the link given below.

https://brainly.com/question/21288807.

Answerrrrrrrrrrrrrrrrrt

Calcium is a 2+ ion which would be written as Ca^2+

Nitrogen is a 3- ion which is written as N^3-

When combined to create Calcium Nitrate it is Ca3N2

See picture:

I = 7 N-s

Explanation:

Impulse is defined as

I = ∆p = m(vf - vi)

We are given

m = 0.2 kg

vi = -10 m/s (to the left)

vf = +25 m/s (to the right)

Therefore, the impulse imparted on the puck is

I = (0.2 kg)[25 m/s - (-10 m/s)]

= (0.2 kg)(35 m/s)

= 7 N-s

Explanation:

700N right

to get the net force

you gotta let one direction be the negative ( the smaller force)

so the total force towards the left is 100N ( 60 + 40= 100)

which is smaller than the right force which is 800 N so you let 100 N be negative

so without even calculating , you can know that it will be moving towards the right because right force > left force

your add both forces ( remember 100 N is negative)

so 800N + ( - 100N)

= 700N

towards the right

hope this helps

this is just one method that helped me understand

please mark it brainliest

Answer:

h = 0.46 m

Explanation:

According to the law of conservation of energy:

Potential Energy Lost by Roller Coaster = Kinetic Energy Gained by Roller Coaster

[tex]mgh = \frac{1}{2}mv^2\\\\2gh = v^2\\\\h = \frac{v^2}{2g}[/tex]

where,

h = height = ?

v = speed at bottom = 3 m/s

g = acceleration due to gravity = 9.81 m/s²

Therefore,

[tex]h = \frac{(3\ m/s)^2}{(2)(9.81\ m/s^2)}[/tex]

h = 0.46 m

Answer:

Explanation:

Use F - f = ma since we are on a flat surface. We are given the applied Force as 8.25, the frictional force as 2.19, and a mass of 2.50. Filling in:

8.25 - 2.19 = 2.50a. Doing the subtraction on the left gives us:

6.06 = 2.50a and we divide to 3 sig figs to get

a = 2.42 m/s/s

Answer:

The Egg

Explanation:

personally the Chicken who would lay the egg would have to come from an Egg itself, then It would have to grow up and then Produce an egg that will produce a chicken and so on.

Answer:

B. temperature of the objects

Answer:

b. 0.94 i think is the answer

Answer:

D 5m/s

Explanation:

Explanation:

apparent apparent weight is how hard astronaut pushes against it which is the normal force

n m a y + mgm open parenthesis y + and close parenthesis and = m open parenthesis a y + and so i need the acceleration of the astronaut since initial velocity is 0 and yby over l 45 m per second over 15 x 30.0 m m per second squared

Answer:

220,500 Joules

Explanation:

PE = (75 kg) x (9.8 [tex]m/s^{2}[/tex]) x (300 m)

PE = (735) x (300)

PE = 220,500 Joules

Answer:

googli moogli

Explanation:

Answer:

–77867 m/s/s.

Explanation:

From the question given above, the following data were obtained:

Initial velocity (u) = 34.5 m/s

Final velocity (v) = –23.9 m/s

Time (t) = 0.00075 s

Acceleration (a) =?

Acceleration is simply defined as the rate of change of velocity with time. Mathematically, it is expressed as:

Acceleration = (final velocity – Initial velocity) /time

a = (v – u) / t

With the above formula, we can obtain acceleration of the ball as follow:

Initial velocity (u) = 34.5 m/s

Final velocity (v) = –23.9 m/s

Time (t) = 0.00075 s

Acceleration (a) =?

a = (v – u) / t

a = (–23.9 – 34.5) / 0.00075

a = –58.4 / 0.00075

a = –77867 m/s/s

Thus, the acceleration of the ball is –77867 m/s/s.

X component of force    Fx=Fcos45=50×cos×45

Y component of force    Fy=Fsin45=50×sin×45

Answer:

See explanation

Explanation:

The ability of the Kangaroo to jump higher is due to the stretching of its tendons as its speed increases.

As the tendons are being stretched more and more, the elastic potential energy increases with each increasing stretch.

This elastic potential energy is translated into gravitational potential energy hence the Kangaroo jumps higher as it's speed increases.

The kangaroo can  jump higher as it's speed increases due to the ability of its tendons to stretch more and more.

The jumping of kangaroo can be related with the concept of spring force and spring potential energy. The spring force is given as,

F = kx

And spring elastic potential energy is,

[tex]U=\dfrac{1}{2}kx^{2}[/tex]

In both the cases, k is the spring constant and x is the stretching distance.

Thus, we can conclude that the kangaroo can  jump higher as it's speed increases due to the ability of its tendons to stretch more and more, such that more energy conversion of energy takes place.

Learn more about the elastic potential energy here:

https://brainly.com/question/25029446

Answer:

What is Emission of Light? Atoms, molecules, or solids that are excited to high energy levels can decay to lower levels by emitting radiation (emission or luminescence). ... Atomic emission and molecular fluorescence are therefore useful for quantitating emitting species.

Explanation:

correct me if i am wrong

Answer:

Small sparks can lead to huge explosion if they are left unattended.

Explanation:

Small sparks are not harmful but if these sparks happen near some hazardous material or object then it could lead to heavy explosion. If there is some chemical substance near the spark or there are magnetic lines which can explode the spark then these minor sparks could result in heavy disastrous explosion.

Answer:leter B the answer

Explanation:

The additional information is needed in order to calculate the acceleration of the car is the total time of the car's motion.

The acceleration of an object is the rate of change of velocity with time.

a = Δv/t

where;

When the change in velocity of the object and time of motion is known, the acceleration of the object can be determined.

Thus, the additional information is needed in order to calculate the acceleration of the car is the total time of the car's motion.

Learn more about acceleration here: https://brainly.com/question/14344386

Answer:

Actually, the substance is the one that changes from liquid to gas.

The molecule just gains energy which overcomes the attraction force between it and neighboring molecule.

Answer:

λ = 5.85 x 10⁻⁷ m = 585 nm

f = 5.13 x 10¹⁴ Hz

Explanation:

We will use Young's Double Slit Experiment's Formula here:

[tex]Y = \frac{\lambda L}{d}\\\\\lambda = \frac{Yd}{L}[/tex]

where,

λ = wavelength = ?

Y = Fringe Spacing = 6.5 cm = 0.065 m

d = slit separation = 0.048 mm = 4.8 x 10⁻⁵ m

L = screen distance = 5 m

Therefore,

[tex]\lambda = \frac{(0.065\ m)(4.8\ x\ 10^{-5}\ m)}{5\ m}[/tex]

λ = 5.85 x 10⁻⁷ m = 585 nm

Now, the frequency can be given as:

[tex]f = \frac{c}{\lambda}[/tex]

where,

f = frequency = ?

c = speed of light = 3 x 10⁸ m/s

Therefore,

[tex]f = \frac{3\ x\ 10^8\ m/s}{5.85\ x\ 10^{-7}\ m}\\\\[/tex]

f = 5.13 x 10¹⁴ Hz

Answer: same force in opposite direction.

Explanation: Charges of opposite sign attracts each other and charges with same sign repel each other. Because only sign of negative charge changes, and absolute value of charge remains same, value of force is same but is in opposite direction.

Answer:

A) same force, but in the opposite direction

Explanation:

he's right

I don't know‍♀ what is your favorite song

Answer:

v = 771.75 mile / h

Explanation:

The speed of sound is v = 343 m / s  at T= 20C

the transformation ratios are

     1 mile = 1600 m

     1 h = 3600 s

Let's reduce

    v = 343 m / s (1 mile / 1600 m) (3600 s / 1 h)

    v = 771.75 mile / h

Answer:

2.5m/s²

Explanation:

a = v/t

Where;

V = velocity (m/s)

a = acceleration (m/s²)

t = time (s).

According to the information provided in this question,

a = ?

v = 10m/s

t = 4

a = 10/4

a = 2.5m/s²

Here, the hydrogen atoms are combined to form a helium atom, and during this process of fusion, a significantly large amount of energy is released. Thus, stars produce a large amount of energy by forming helium from the combination of hydrogen in its core. Hence, the correct answer is option (C).

Answer:

A. Creating helium from hydrogen in its core.

Explanation:

Sacrificed my grade for points I hope it helps

Answer:

b 60 N force

Explanation:

The change in the momentum is given by the force•distance from the attached point. We don't have any distance, but apparently, the stick forces are being applied in each quarter of the stick, so let's use fractions of 4 to solve it:

150 N:

150•1/4 = 37.5

30 N:

30•2/4 = 30•1/2 = 15

60 N:

60•3/4 = 45

40 N:

40•4/4 = 40•1 = 40

Answer:

t = 8.94 s

Explanation:

We will use the second equation of motion to calculate the time taken by the cart:

[tex]s = v_it + \frac{1}{2} at^2[/tex]

where,

s = distance = 200 m

vi = initial speed = 0 m/s

t = time taken = ?

a = acceleration = 5 m/s²

Therefore,

[tex]200\ m = (0\ m/s)(t)+\frac{1}{2}(5\ m/s^2)t^2\\\\t^2 = \frac{(200\ m)(2)}{5\ m/s^2}\\\\t = \sqrt{80\ s^s}[/tex]

t = 8.94 s