A baseball batter hits an incoming 45.0-m/s fastball. The ball leaves the bat at 56.0 m/s after a ball-on-bat contact time of 0.040 s. What is the force exerted on the 0.25-kg baseball?
a. 631 N
b. 68.8 N
c. 350 N
d. 16.2 N
e. 281 N
a
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A spring scale typically indicates the magnitude of the tension force exerted on its bottom hook. What will the scale read in each of the cases shown in the diagram?
A. 49 N
B. 98 N
C. 196 N
D. Other (specify)
Incompressible flow means that the fluid's density is constant
Indicate whether the statement is true or false
Consider three galaxies, Alpha, Beta and Gamma. An observer in Beta sees the other two galaxies each moving away from him in opposite directions at speed 0.70c. At what speed would an observer in Alpha see the galaxy Beta moving?
A) 0.82c B) 0.70c C) 0.94c D) 0.35c E) 0.57c
A proton with mass 1.67 × 10^-27 kg moves with a speed of 0.800c in an accelerator. What is its kinetic energy? (c = 3.00 × 10^8 m/s)
a. 7.52 × 10^-11 J c. 9.02 × 10^-11 J b. 1.00 × 10^-10 J d. 3.76 × 10^-11 J