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3 years ago

If two identical cars are traveling at different velocities, which car has the greatest momentum

Physics

1 answer:

vodomira [7]3 years ago

8 0

Answer:

The one with highest velocity

Explanation:

The momentum of an object is given by

$p=mv$

where

m is the mass of the car

v is the velocity of the car

In this problem, we have two identical cars: identical means they have same mass, so

$m_1 = m_2 = m$

The momentum of car 1 is

$p_1 = mv_1$

while the momentum of car 2 is

$p_2 = mv_2$

By comparing the two expressions, we see that the car with greatest momentum is the one with highest velocity, since the mass is the same.

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A horizontal 803-N merry-go-round is a solid disk of radius 1.41 m and is started from rest by a constant horizontal force of 49

Slav-nsk [51]

Answer:

The kinetic energy of the disk is 254.4 J.

Explanation:

The kinetic energy of the disk is given by:

$K = \frac{1}{2}I \omega^{2}$

The moment of inertia of the solid disk is:

$I = \frac{1}{2}mr^{2}$

The mass is:

$m = \frac{P}{g}$

$I = \frac{Pr^{2}}{2g} = \frac{803 N*(1.41 m)^{2}}{2*9.81 m/s^{2}} = 81.4 kgm^{2}$

Now, we need to find the angular acceleration as follows:

$\tau = I \alpha$

Also, the torque is related to the tangential force:

$\tau = F\times r$

$F\times r = I \alpha$

$\alpha = \frac{F \times r}{I} = \frac{49.7 N*1.41 m}{81.4 kg*m^{2}} = 0.86 rad/s^{2}$

Now, we can find the angular speed:

$\omega_{f} = \omega_{i} + \alpha t$

$\omega_{i} = 0$ since it is started from rest

$\omega_{f} = 0.86 rad\s^{2}*2.90 s = 2.50 rad/s$

Finally, the kinetic energy of the disk is:

$K = \frac{1}{2}I \omega^{2} = \frac{1}{2}81.4 kgm^{2}*(2.50 rad/s)^{2} = 254.4 J$

Therefore, the kinetic energy of the disk is 254.4 J.

I hope it helps you!

5 0

2 years ago

Identify conditions that can contribute to an increase in wind erosion.

nalin [4]

Lake effect is one condition

Sorry if this didn't help- I'm not quite sure what you're asking.

8 0

3 years ago

Read 2 more answers

A 26.0 kg beam is attached to a wall with a hinge while its far end is supported by a cable such that the beam is horizontal. If

Nuetrik [128]

Answer:

Force exerted by the hinge on the beam = 109.24N

Explanation:

Weight = mg = 26 x 9.81 = 255.06 N

Vertical component = T sin θ

Horizontal component = Tcos θ

Now, there are 3 vertical forces acting on the beam. These are;

- The downward force which is the weight of the beam.

- The vertical components of the tension in the cable.

-The force that hinge exerts on the beam are the upward forces.

Hence, for the beam to remain horizontal, the sum of the upward forces must be equal to the weight of the beam.

For us to determine the vertical component of the tension in the cable, we will do a torque problem. Let the pivot point be at the hinge. Let’s assume that the length of the beam is L. The vertical component of the tension in the cable will produce clockwise torque while the weight of the beam will produce counter clockwise torque.

Tbus;

Clockwise torque = TL sin 61

Since the center of mass of beam is at the middle of the beam, the distance from the hinge to the weight of the beam is L/2.

Counter clockwise torque = WL/2

Thus;

TL sin 61 = WL/2

L will cancel out.

T sin 61 = 255.06/2

T x 0.8746 = 127.53

T = 127.53/0.8746 = 145.82 N

Now, the equation to determine the vertical component of the force that the hinge exerts on the beam is given as;

T + F = W

Thus;

145.82 + F = 255.06

F = 255.06 - 145.82 = 109.24 N

8 0

3 years ago

A seagull flying horizontally at 8.00m/s carries a clam with a mass of 300g in its beak. Calculate the total mechanical energy o

Stells [14]

Answer:

9.6J+88.2J=97.8J

Explanation:

Here the velocity of the seagull is given,mass is given and its height.

We have to find its mechanical energy my friend.

Mechanical energy=kinetic energy + potential energy.

First we will find kinetic energy.

For calculating kinetic energy we need mass and velocity,which are given here.

So, Ek=

$1 \div 2mv {?}^{2}$

So by substituting the values we get 9.6J.

Now we find the potential energy which is mgh.

By substituting the values we get 88.2J.

Then we add both of those and get 97.8J

I hope this satisfies you and make sure you contact me if it doesn't

7 0

3 years ago

Plsssss I need te answer quick

jok3333 [9.3K]

Explanation:

reflection ... . .......

3 0

3 years ago

Read 2 more answers

If two identical cars are traveling at different velocities, which car has the greatest momentum ​

If two identical cars are traveling at different velocities, which car has the greatest momentum