Physics Questions & Answers

Physics Questions & Answers "Hang time" is the time a jumper's feet are off the ground in a vertical jump. If a person jumped straight up and measured his/her hang time, then runs horizontally and jumps with the same vertical component of takeoff velocity, the hang time will be - CORRECT ANSWER- No different (Arrow)10m to right (Arrow)5m up Calculate the resultant vector for the diagram above. - CORRECT ANSWER- 11.2 meters A 4.0 kg rock and 1 kg stone fall freely from rest from a height of 100 meters. After they fall for 2.0 seconds, the ratio of the rock's speed to the stone's speed is - CORRECT ANSWER- 1:1 A 5.23 meter ladder leans against a wall (at a 29.4° angle of elevation). What is the height above the ground where the top of the ladder makes contact with the wall? - CORRECT ANSWER5.23 meters • sin (29.4°) A ball is thrown horizontally from the top of a tower at the same instant that a stone is dropped vertically. Which object is traveling faster when it hits the level ground below if neither of them experiences any air resistance? - CORRECT ANSWER- The ball A ball is thrown horizontally with an initial velocity of 20.0 meters per second from the top of a tower 60.0 meters high. What is the initial vertical velocity of the ball? - CORRECT ANSWER0 m/s A ball rolls over the edge of a platform with only a horizontal velocity. The height of the platform is 1.6 m and the horizontal range of the ball from the base of the platform is 20.0 m. What is the horizontal velocity of the ball just before it touches the ground? Neglect air resistance. - CORRECT ANSWER- 35 m/s A ball rolls over the edge of a platform with only a horizontal velocity. The height of the platform is 1.6 m and the horizontal range of the ball from the base of the platform is 20.0 m. What is the horizontal velocity of the ball just before it touches the ground? Neglect air resistance. - CORRECT ANSWER- 35 m/s A ball thrown horizontally from a point 24 m above the ground, strikes the ground after traveling horizontally a distance of 18 m. With what speed was it thrown, assuming negligible air resistance? - CORRECT ANSWER- 8.2 m/s A boat moves 2.50 m/s north across a river flowing 1.20 m/s east. What is the approximate speed of the boat relative to the shore? - CORRECT ANSWER- 2.8 m/s