The coulomb is the same as
A)
T?A/m.
B)
A?s.
C)
A/s.
D)
all of the above
E)
none of the above
B
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On a smooth horizontal floor, an object slides into a spring which is attached to another mass that is initially stationary
When the spring is most compressed, both objects are moving at the same speed. Ignoring friction, what is conserved during this interaction? A) momentum and mechanical energy B) momentum only C) kinetic energy only D) momentum and kinetic energy E) momentum and potential energy
I drop a 55-g golf ball from 2.50 m high. It rebounds to 1.65 m. How much energy is lost?
a. 0.46 J b. 4.6 J c. 0.51 J d. 0.41 J e. 0
Ariel claims that a pulse is described by the equation where x and y are measured in cm and t in s. Miranda says that it is not possible to represent a pulse with this function because a wave must be a function of x + vt or x ? vt. Which one, if either, is correct, and why?
a. Ariel, because x2 – 6.0xt + 9t2 = (x – 3.0t)2. b. Ariel, because a pulse is not an infinite wave. c. Miranda, because (x – 3.0t)2 is the same as (3.0t – x)2. d. Miranda, because a pulse is not an infinite wave. e. Miranda, because is infinite when x = 0.
A 20-N crate starting at rest slides down a rough 5.0-m long ramp, inclined at 25° with the horizontal. 30 J of energy is lost to friction. What will be the speed of the crate at the bottom of the incline?
a. 0.98 m/s c. 3.5 m/s b. 2.1 m/s d. 4.7 m/s