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You throw a tennis ball (mass m = 0.55 kg) inside your apartment from the floor level directly upwards with an initial speed of v0 = 15 m/s. The ceiling is 3.5 m above the floor. The ball hits the ceiling, bounces back at 5 m/s, and then hits the floor. The time of the impact between the ball and the ceiling is 2.5×10^-3 s. (hints: for (a) use energy conservation; (b) use momentum-impact theorem; (c) use energy conservation)
Find:
(a) the impact speed (in m/s) of the tennis ball before it hits the ceiling
(b) the average force (in N) the ceiling exerts on the ball during the impact
(c) the impact speed (in m/s) of the tennis ball before it hits the floor
A glass rod is initially neutral. It is then rubbed against a silk cloth. Afterwards, the rod has a charge of +5.0 C, How many electrons did the glass rod lose or gain
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What is the ratio of the frequency you hear while the car is approaching to the frequency you hear while the car is moving away?
a given star is a sphere with a radius of 5.81x108 m and an average surface temperature of 6970 k. determine the amount
A parallel-plate capacitor has circular plates of 10.1 cm radiusand 1.28 mm separation. (a) Calculate the capacitance in picofarads. (b) What charge in nanocoulombs will appear on the plates if a potential difference of 135 V is applied?
Two satellites are in circular orbits around a planet that has radius 9.00*10^6 m. One satellite has mass 77.0kg , What is the orbital speed of this second satellite
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