Impulse: The graph in the figure shows the x component F of the net force that acts for 10 s on a 100-kg crate. What is the change in the momentum of the crate during the 10 s that this force acts?
A. -100 kg ? m/s
B. -25 kg ? m/s
C. 75 kg ? m/s
D. -75 kg ? m/s
E. 25 kg ? m/s
Answer: D
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On the H-R diagram, 90 percent of all stars are _______________
Fill in the blank(s) with correct word
A roller-coaster car has a mass of 500 kg when fully loaded with passengers. At the bottom of a circular dip of radius 40 m (as shown in the figure) the car has a speed of 16 m/s. What is the magnitude of the force of the track on the car at the bottom of the dip?
a.
3.2 kN
b.
8.1 kN
c.
4.9 kN
d.
1.7 kN
e.
5.3 kN
At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction, a 75-g particle has a velocity of 20 m/s in the positive x direction. What is the speed of the center of mass of this two-particle system at this instant?
A. 16 m/s B. 45 m/s C. 23 m/s D. 20 m/s E. 36 m/s
Define atomic mass number
What will be an ideal response?