The force of a boxer's punch is greater when it hits a
A) small punching bag.
B) heavy punching bag.
C) both forces would be the same for the same effort
Answer: B
You might also like to view...
An electromagnetic wave is created by
A. an electrical charge moving at a certain velocity. B. all electric charges. C. a magnetic moving with a certain velocity. D. an accelerating electric charge.
Answer the following statement(s) true (T) or false (F)
1. The electric field inside a conductor must be zero in all possible circumstances. 2. In static equilibrium, any excess charge on a conductor is uniformly spread on its surface. 3. A closed metal can (in static equilibrium) will perfectly shield a point in its interior from the static field of any external charged particle(s). 4. If the electric field at any point inside a conductor is nonzero, the metal is not in static equilibrium.
The three blocks shown are released from rest and are observed to move with accelerations that have a magnitude of 1.5 m/s2. What is the magnitude of the friction force on the block that slides horizontally? Disregard any pulley mass or friction in the pulley and let M = 2.0 kg.
A. 6.0 N B. 5.1 N C. 5.5 N D. 4.6 N E. 3.7 N
A bat, flying at 7.00 m/s toward a wall, emits a chirp at 50.0 kHz. If the wall reflects this sound pulse, what is the frequency of the echo received by the bat? (vsound = 340 m/s)
a. 52.1 kHz b. 51.1 kHz c. 50.0 kHz d. 49.0 kHz e. 48.6 kHz