QUESTION 1 If you hit a 100-kg punching bag with an impulse of 10 kg*m/s, with w
ID: 1280580 • Letter: Q
Question
QUESTION 1
If you hit a 100-kg punching bag with an impulse of 10 kg*m/s, with what initial velocity will the bag recoil?
0.1 m/s
10 m/s
90 m/s
1000 m/s
The bag will not move
QUESTION 2
Under what condition is the total mechanical energy of a system conserved?
When only gravity acts on an object
When the system feels no forces at all
When the system feels a net force of zero
When the system feels no friction forces
When the system is in equilibrium
QUESTION 3
How does the momentum of a car traveling 20 m/s on Earth and that of the same car traveling 20 m/s on the Moon compare?
The car has more momentum on Earth
The car has more momentum on the Moon
Both momentum values would be the same
It depends on what the car is made of
Both momentums would just be zero
QUESTION 4
What is another way of describing and "impulse"?
m*v
Final momentum - Initial momentum
F / t
(1/2)*m*v^2
Useful energy / Input energy
QUESTION 5
You fire a 0.3-kg water balloon from a 1-kg rubber slingshot. If the balloon launches with a speed of 10 m/s, with what speed would the slingshot recoil if you weren
A.0.1 m/s
B.10 m/s
C.90 m/s
D.1000 m/s
E.The bag will not move
Explanation / Answer
1. velcoity = 10/100 = 0.1 opiton A
2..
When the system is in equilibrium
3.A.
The car has more momentum on Earth
4. B.
Final momentum - Initial momentum
5, D 30 m/s
6. true
7. true
8. flase
9. flase
10. true
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