Which has more momentum, a speeding baseball or an ocean liner at rest in a harbor?
Baseball.
Ocean liner.
Both the same.
Can't say without more information.
2 . A truck moves with a certain momentum. If both its speed and its mass are doubled, how much greater is its momentum?
Two times.
Four times.
Eight times.
Unchanged, the same.
3 . If a fast-moving object strikes you, you'll experience less force of impact if you can
shorten the time the momentum decreases.
increase the time the momentum decreases.
either shorten or increase the time, for the result is the same.
4 . If your speeding car slams into a haystack and comes to rest, how will the IMPULSE that acts on it compare with slamming into a brick wall and coming to rest?
The impulse will be more.
The impulse will be less.
The amount of impulse will be the same either way.
5 . A fast-moving massive car has a head-on collision with a slow-moving light car. Upon which is the impulse greater?
The massive car.
The light car.
Impulse is the same on both.
More information is needed to correctly answer this.
6 . A cannon with a long barrel fires a shell faster because the shell experiences a greater
acceleration.
impulse.
change in inertia.
None of these.
7 . If superman in space throws a boulder with 10 times as much mass as himself, and the boulder leaves his hands at 100 km/h, how fast does superman recoil?
The same speed, 100 km/h.
10 km/h.
1000 km/h.
None of these are correct.
8 . Two identical gliders slide toward each other on an air track. One moves at 2 m/s and the other at 1 m/s. If they stick together, the combination slides at
0.5 m/s.
1 m/s.
1.5 m/s
2 m/s
2.5 m/s.
duplicate.
1. To determine which has more momentum, a speeding baseball or an ocean liner at rest in a harbor, we need to calculate their respective momenta. Momentum is defined as the product of an object's mass and velocity. The equation for momentum is:
Momentum = Mass x Velocity
The baseball has a smaller mass and higher velocity, while the ocean liner has a larger mass and zero velocity (since it is at rest). Since the baseball has a non-zero velocity, its momentum will be greater than zero. Therefore, the correct answer is "Baseball."
2. The momentum of an object is directly proportional to both its mass and velocity. In this case, if the speed and mass of the truck are both doubled, we need to determine how the momentum changes.
Momentum = Mass x Velocity
When both the speed and mass are doubled, we have:
New Momentum = (2 x Mass) x (2 x Velocity) = 4 x Mass x Velocity
Therefore, the momentum is four times greater than the original momentum. The correct answer is "Four times."
3. When a fast-moving object strikes you, the force of impact will be determined by the change in momentum. You can experience less force of impact if you can increase the time over which the momentum decreases. This can be achieved by either moving or cushioning the impact, thereby increasing the time duration. The correct answer is "increase the time the momentum decreases."
4. When your speeding car slams into a haystack and comes to rest, the impulse that acts on it will be less compared to slamming into a brick wall and coming to rest. Impulse is defined as the change in momentum, and it is equal to the force applied multiplied by the time over which it acts. When your car hits a haystack, it provides a cushioning effect, increasing the time over which the momentum decreases. This reduces the force of impact and decreases the impulse. The correct answer is "The impulse will be less."
5. The impulse experienced by an object is equal to the change in momentum it undergoes. In the case of a head-on collision between a fast-moving massive car and a slow-moving light car, the impulse on the objects will be the same. Impulse does not depend on the mass or velocity of the objects involved, but rather on the change in momentum. The correct answer is "Impulse is the same on both."
6. A cannon with a long barrel fires a shell faster because the shell experiences a greater acceleration. The length of the barrel allows the force of the expanding gases to act on the shell for a longer period of time, allowing it to accelerate to a higher velocity. The correct answer is "acceleration."
7. To determine the speed at which Superman recoils after throwing a boulder, we can use the principle of conservation of momentum. The total momentum before the event is equal to the total momentum after the event, assuming no external forces act on the system.
Since the boulder has 10 times the mass of Superman, its momentum will be 10 times greater. However, since the boulder is thrown, it gains momentum in the forward direction, and Superman recoils in the opposite direction. This means the magnitudes of the momenta are equal.
Therefore, Superman will recoil with a speed equal to the speed at which the boulder leaves his hands, which is 100 km/h. The correct answer is "The same speed, 100 km/h."
8. When two identical gliders slide toward each other and stick together upon collision, the conservation of momentum applies. The total momentum before the collision is equal to the total momentum after the collision.
If one glider moves at 2 m/s and the other at 1 m/s, their momenta are:
Momentum1 = Mass x Velocity = Mass x 2 m/s
Momentum2 = Mass x Velocity = Mass x 1 m/s
The total momentum before the collision is the sum of the individual momenta, so:
Total Momentum before collision = 2 x Mass + 1 x Mass = 3 x Mass
After the collision, the two gliders stick together and move with a common velocity:
Total Momentum after collision = Mass x Velocity
Using conservation of momentum:
Total Momentum before = Total Momentum after
3 x Mass = Mass x Velocity
Simplifying the equation:
3 = Velocity
Therefore, the combination slides at a speed of 1 m/s. The correct answer is "1 m/s."