A ball of mass m falls from a height h to the surface of the Earth.Which one of the following is correct?(assume that h is much smaller than the radius of the Earth)A) If we choose our system to be ball+Earth then the work done on the system is mgh.B) If we choose our s...
A ball of mass 0.2kg is dropped from a height of 2.5 m above horizontal ground. After hittingthe ground it bounces to a height of 1.8 m above the ground. Find the magnitude of the impulsereceived by the ball from the ground. 相关知识点: 试题来源: 解析 2.59Ns (2 d.p.) 反...
A ball of mass m is dropped from a height H. When it hits the ground, it rebounds to a height h. If the time of contact with the ground is t, and the average force exerted by the ground on the ball during the collision is F. Which of the following equations is correct accor...
英文物理题 A ball of mass 0.100 kg is dropped from rest from a height of 1.25 m. It rebounds from the floor to reach a height of 0.840 m. What impulse(with direction) was given to the ball by the floor? 不是要翻译。。要答案 答案 let me try.Since the question is in English,i...
【题目】A ball of mass 200 g travelling horizontally at 6m s- strikes a verticalwall at right angles and rebounds with a speed of 4ms-. Find themagnitude of the impulse given to the ball.Assuming that contact between the ball and the wall lasts for0. I seconds, find the force (...
Answer to: A ball of mass 8 \ kg falls from a height of 100 \ m, neglecting air resistance. calculate its total energy after falling a distance. By...
4 A hard ball of mass 1.0 kg falls freely from rest through a height of 80 m and comes to rest having penetrated 9.0 cm of sand.A80m Sand9.0 cm BFig. 4.1(a) Describe how the energy changes as the ball falls from A to B.(b) Determine the velocity of the ball just before it...
11 A ball of mass 400 g rolls down a hill. 2.0 m above the bottom of the hill, the speed of the ball is 3 0 m/s.3.0 m/s2.0m The gravitational field strength g is 10 N/kg. Ignoring the effects of friction and air resistance, what is the kinetic energy of the ball at the...
题目 A boy caught a ball of mass 200g moving with a speed of 30 m/s. If the catching process be completed in 0.1 s, the average net force of impact exerted by the ball on the hands of the boy is A 30N B 20N C 40N D 60N 相关知识点: 试题来源: 解析 D 反馈 收藏 ...
A ball of mass m is suspended from a rope of length L. Now the ball is set into freely swinging circular motion in a vertical plane. If the centripetal acceleration of the ball at the top of the circle is 13g, its centripetal acceleration at the bottom of the circle is closest to ...