A baseball, mass 0.5 kg, is traveling to the right at 32.2 m/s when it is hit by a bat and travels the opposite direction at 72.2 m/s. The bat hits the ball with a force of 1,222 N. What is the ball’s change in momentum and how long was the ball in contact with the bat?
Two students are on a balcony 19.6 m above the street. One student throws a ball vertically downward at 14.7 m/s. At the same instant, the other student throws a ball vertically upward at the same speed. The second ball just misses the balcony on the way down.
A wheel of radius R and negligible mass is mounted on a horizontal frictionless axle so that the wheel is in a vertical plane. Three small objects having masses [katex]m[/katex], [katex]M[/katex], and [katex]2M[/katex], respectively, are mounted on the rim of the wheel, as shown above. If the system is in static equilibrium, what is the value of [katex]m[/katex] in terms of [katex]M[/katex] ?
What condition(s) are necessary for static equilibrium?
A spinning ice skater on extremely smooth ice is able to control the rate at which she rotates by pulling in her arms. Which of the following statements are true about the skater during this process?
Two masses m1 and 4m1 are on an incline. Both surfaces have the same coefficient of kinetic friction. Both objects start from rest, at the same height. Which mass has the largest speed at the bottom?
A 1509 g wood block is being pulled by the force meter at a constant velocity. Using the graph below find:
Which of the following graphs shows runners moving at the same speed? Assume the y-axis is measured in meters and the x-axis is measured in seconds.
A simple pendulum oscillates with amplitude [katex]A[/katex] and period [katex]T[/katex], as represented on the graph above. Which option bests represents the magnitude of the pendulum’s velocity [katex]v[/katex] and acceleration [katex]a[/katex] at time [katex] \frac{T}{2} [/katex]?
In 2014, the European Space Agency placed a satellite in orbit around comet 67P/Churyumov-Gerasimenko and then landed a probe on the surface. The actual orbit was elliptical, but we can approximate it as a 50 km diameter circular orbit with a period of 11 days.
An eagle is flying horizontally at 6.0 m/s with a fish in its claws. It accidentally drops the fish.
A forward horizontal force of 12 N is used to pull a 240 N crate at constant velocity across a horizontal floor. The coefficient of friction is
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