Homework Answers
answer all please 1 If a 71-kg astronaut at rest in space throws a ball with...
answer all please
1 If a 71-kg astronaut at rest in space throws a ball with mass 0.61 kg at a speed of 12 mph. What happens to the astronaut as a result? 4 A moving ball collides elastically with another ball that is twice as heavy and is initially at rest. What happens to the lighter ball as a result of the collision? (a) She picks up some of the movement of the ball, causing her to move forward....
39. (4 pts) A 500-g mass drops from a height of 10.0 meters. What is its...
39. (4 pts) A 500-g mass drops from a height of 10.0 meters. What is its speed just before it hits the ground? 40. (4 pts) A flight attendant pulls a wheeled suitcase, applying a 66-N force at a 35° angle to the horizontal. How much work does she do in pulling the suitcase 45 m? 41. (4 pts) A 1525-kg car drives up a mountain road a vertical rise of 1301 m from the base elevation in 30. min...
4. In a collision which of the following quantities is always conserved? A). Acceleration B). Energy...
4. In a collision which of the following quantities is always conserved? A). Acceleration B). Energy C). Kinetic Energy D). Momentum 5. If the applied force is perpendicular to the motion of the object then the Work done by the force is ___ A). Negative B). Positive C). Zero 6. A car, travelling at 40m/s slows to 10m/s in 5 seconds. What was the acceleration? A). -6 m/s? B). -4m/s2 C).-2 m/s2 D). -9.8m/s 7. A ball thrown straight up...
Hi I need help with the following problems: 1.A ball is thrown horizontally from the roof...
Hi I need help with the following problems: 1.A ball is thrown horizontally from the roof of a building 45.0 m tall and lands 24.0 m from the base. What was the ball’s initial speed? 2.A football is kicked at ground level with a speed of at an angle of 36.9º to the horizontal. How much later does it hit the ground? How height does it rise? What is its range? 3.A projectile is fired with an initial speed of...
Page 2 11) The fastest measured pitched baseball left the pitchers hand at a speed of...
Page 2 11) The fastest measured pitched baseball left the pitchers hand at a speed of 45 m/s. If the pitcher was in contact with the ball over a distance of 1.5 m and produced constant acceleration a) what acceleration did he give the ball, and b) how much time did it take him to pitch it? 12) A car accelerates from 20 m/s to 50 m/s in 3 s. What is the cars acceleration? 13) A car accelerates from...
4. A ball with a mass of 3 kg moving at 5 m/s collides with a...
4. A ball with a mass of 3 kg moving at 5 m/s collides with a 9 kg ball at rest. After the collision, the impacting (3 kg) ball bounces back at a speed of 2.5 m/s. How fast does the 9 kg ball move and in what direction?
Ball A, of mass 0.6kg, is initially moving to the right at 4 m/s. Ball B,...
Ball A, of mass 0.6kg, is initially moving to the right at 4 m/s. Ball B, of mass 1.8kg, is initially to the right of ball A and moving to the right at 2 m/s. After the two balls collide, ball B is moving at 3 m/s in the same direction as before. What is the velocity of ball A after this collision. Is this collision elastic or inelastic? What is the fractional change in kinetic energy?
4. In the game of billiards, all balls have a mass of 0.17 kg. The cue...
4. In the game of billiards, all balls have a mass of 0.17 kg. The cue ball, initially movlng 3 m/s E, collides with the 2 ball, initially at rest. After the collision, the 2 ball travels at 1.5 m/s in a direction of 60° S of E. What is the speed of the cue ball after the collision if it travels at an angle of 30° N of E? A. 1.5 m/s B. 1.8 m/s C. 2.6 m/s D....
6. A ball of mass 10.0 g slides on a circular horizontal stationary roulette wheel of...
6. A ball of mass 10.0 g slides on a circular horizontal stationary roulette wheel of circumference 2.00 m. Its initial speed is 5.00 m/s, but after moving around the circle once its speed has decreased to 4.00 m/s because of friction. What is the coefficient of kinetic friction between the ball and the wheel? (A) 0.100 (B) 0.200 (C) 0.210 (D) 0.220 (E) 0.230 (F) 0.240 (G) 0.250 (H) 0.980. TURN THE PAGE OVER
6) An auto manufacturer advertises that their car can go "from zero to sixty in eight...
6) An auto manufacturer advertises that their car can go "from zero to sixty in eight seconds." This is a description of what characteristic of the car's motion? A) instantaneous speed B) displacement C) average speed D) instantaneous acceleration E) average acceleration 7) A light-year is the distance that light travels in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in one light-year? (1 mi = 1609 m, 1 y = 365...
answer all please
1 If a 71-kg astronaut at rest in space throws a ball with mass 0.61 kg at a speed of 12 mph. What happens to the astronaut as a result? 4 A moving ball collides elastically with another ball that is twice as heavy and is initially at rest. What happens to the lighter ball as a result of the collision? (a) She picks up some of the movement of the ball, causing her to move forward....
39. (4 pts) A 500-g mass drops from a height of 10.0 meters. What is its speed just before it hits the ground? 40. (4 pts) A flight attendant pulls a wheeled suitcase, applying a 66-N force at a 35° angle to the horizontal. How much work does she do in pulling the suitcase 45 m? 41. (4 pts) A 1525-kg car drives up a mountain road a vertical rise of 1301 m from the base elevation in 30. min...
4. In a collision which of the following quantities is always conserved? A). Acceleration B). Energy C). Kinetic Energy D). Momentum 5. If the applied force is perpendicular to the motion of the object then the Work done by the force is ___ A). Negative B). Positive C). Zero 6. A car, travelling at 40m/s slows to 10m/s in 5 seconds. What was the acceleration? A). -6 m/s? B). -4m/s2 C).-2 m/s2 D). -9.8m/s 7. A ball thrown straight up...
Page 2 11) The fastest measured pitched baseball left the pitchers hand at a speed of 45 m/s. If the pitcher was in contact with the ball over a distance of 1.5 m and produced constant acceleration a) what acceleration did he give the ball, and b) how much time did it take him to pitch it? 12) A car accelerates from 20 m/s to 50 m/s in 3 s. What is the cars acceleration? 13) A car accelerates from...
4. In the game of billiards, all balls have a mass of 0.17 kg. The cue ball, initially movlng 3 m/s E, collides with the 2 ball, initially at rest. After the collision, the 2 ball travels at 1.5 m/s in a direction of 60° S of E. What is the speed of the cue ball after the collision if it travels at an angle of 30° N of E? A. 1.5 m/s B. 1.8 m/s C. 2.6 m/s D....
6. A ball of mass 10.0 g slides on a circular horizontal stationary roulette wheel of circumference 2.00 m. Its initial speed is 5.00 m/s, but after moving around the circle once its speed has decreased to 4.00 m/s because of friction. What is the coefficient of kinetic friction between the ball and the wheel? (A) 0.100 (B) 0.200 (C) 0.210 (D) 0.220 (E) 0.230 (F) 0.240 (G) 0.250 (H) 0.980. TURN THE PAGE OVER
6) An auto manufacturer advertises that their car can go "from zero to sixty in eight seconds." This is a description of what characteristic of the car's motion? A) instantaneous speed B) displacement C) average speed D) instantaneous acceleration E) average acceleration 7) A light-year is the distance that light travels in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in one light-year? (1 mi = 1609 m, 1 y = 365...
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