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4. The man at the window A wishes to throw the 30-kg sack on the ground....
Bob, who has a mass of 71 kg , can throw a 480 g rock with...
Bob, who has a mass of 71 kg , can throw a 480 g rock with a speed of 31 m/s . The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.0 m. a. What constant force must Bob exert on the rock to throw it with this speed? b. If Bob is standing on frictionless ice, what is his recoil speed after releasing the rock?
Bob, who has a mass of 78 kg , can throw a 470 g rock with...
Bob, who has a mass of 78 kg , can throw a 470 g rock with a speed of 33 m/s . The distance through which his hand moves as he accelerates the rock forward from rest until he releases it is 1.0 m. a) What constant force must Bob exert on the rock to throw it with this speed? b) If Bob is standing on frictionless ice, what is his recoil speed after releasing the rock?
A nasty person puts a man m=60 kg into a cart m=100 kg, and places the...
A nasty person puts a man m=60 kg into a cart m=100 kg, and
places the cart against a large spring with k=9000 N/m, compresses
the spring by d=1.75 m, then releases the cart. The man and cart
shoot down a horizontal track with coefficient of friction 0.10.
The track ends at the edge of an extremely deep abyss which is 4.0
m wide. The other side of the abyss is higher than the side of the
track by 5.0...
A man with a mass 80 kg tries to cross a river by swinging from a...
A man with a mass 80 kg tries to cross a river by swinging from a vine. The vine is 11.5 m long and his speed at the bottom is 8.25 m/s. What is the kinetic energy at the bottom of the swing? What is the tension at the bottom of the swing? If the total energy is equal to the KE at the bottom, what angle does the vine make with the vertical when the man first starts swinging...
A 73.8 kg man steps out a window and falls (from rest) 1.13 m to a...
A 73.8 kg man steps out a window and falls (from rest) 1.13 m to a sidewalk. What is his speed just before his feet strike the pavement? If the man falls with his knees and ankles locked, the only cushion for his fall is a 0.518 cm give in the pads of his feet. Calculate the average force exerted on him by the ground in this situation. This average force is sufficient to cause cartilage damage in the joints...
1. 2. Numerical Problems An aeroplane is flying horizontally at a speed of 100 m's releases...
1. 2. Numerical Problems An aeroplane is flying horizontally at a speed of 100 m's releases a bomb at a height of 500 m. Find (1) the time taken by the to reach the ground. (ii) The horizontal distance where the bomb strikes the ground A bomb is dropped from an aeroplane when it is directly above a target at a height of 1500 m. If the speed of the aeroplane in the horizontal direction is be 540 km/h, calculate...
Playing shortstop, you pick up a ground ball and throw it to second base. The ball...
Playing shortstop, you pick up a ground ball and throw it to
second base. The ball is thrown horizontally, with a speed of 26
m/s, directly toward point A (Figure 4-16). When the ball reaches
the second baseman 0.40 s later, it is caught at point B. (Neglect
air resistance.) Figure 4-16
(a) How far were you from the second baseman? m
(b) What is the distance of vertical drop, AB? m
15-37. A man wearing ice skates throws an 8-kg block with an initial velocity of 2...
15-37. A man wearing ice skates throws an 8-kg block with an initial velocity of 2 m/s, measured relative to himself, in the direction shown. If he is originally at rest and completes the throw in 1.5 s while keeping his legs rigid, determine the horizontal velocity of the man just after releasing the block. What is the vertical reaction of both his skates on the ice during the throw? The man has a mass of 70 kg. Neglect friction...
Spider-Man holds the bottom of an elevator with one hand. with his other hand, he holds...
Spider-Man holds the bottom of an elevator with one hand. with his other hand, he holds a spider cord attached to a 30-kg box of explosives at the bottom of the cord. part A Determine the force that the cord exerts on the box if the elevator is at rest. partB Determine the force that the cord exerts on the box if the elevator accelerates up at 2.4 m/s^2 part C Determine the force that the cord exerts on the...
11. Suppose you throw a ball vertically downward with a speed of 49 m/s What would...
11. Suppose you throw a ball vertically downward with a speed of 49 m/s What would be the speed of the ball one second later? 39 m/s. Show calculation: (g = 9.8 m/s) 49 m/s. ) 58.8 m/s. () 10 m/s. () 10 m/s2. 12. What distance will it have travelled after one second? Show calculation: 13. A rifle bullet is fired horizontally at the same instant another bullet is allowed to drop from rest at th Which bullet strikes...
A nasty person puts a man m=60 kg into a cart m=100 kg, and
places the cart against a large spring with k=9000 N/m, compresses
the spring by d=1.75 m, then releases the cart. The man and cart
shoot down a horizontal track with coefficient of friction 0.10.
The track ends at the edge of an extremely deep abyss which is 4.0
m wide. The other side of the abyss is higher than the side of the
track by 5.0...
1. 2. Numerical Problems An aeroplane is flying horizontally at a speed of 100 m's releases a bomb at a height of 500 m. Find (1) the time taken by the to reach the ground. (ii) The horizontal distance where the bomb strikes the ground A bomb is dropped from an aeroplane when it is directly above a target at a height of 1500 m. If the speed of the aeroplane in the horizontal direction is be 540 km/h, calculate...
Playing shortstop, you pick up a ground ball and throw it to
second base. The ball is thrown horizontally, with a speed of 26
m/s, directly toward point A (Figure 4-16). When the ball reaches
the second baseman 0.40 s later, it is caught at point B. (Neglect
air resistance.) Figure 4-16
(a) How far were you from the second baseman? m
(b) What is the distance of vertical drop, AB? m
15-37. A man wearing ice skates throws an 8-kg block with an initial velocity of 2 m/s, measured relative to himself, in the direction shown. If he is originally at rest and completes the throw in 1.5 s while keeping his legs rigid, determine the horizontal velocity of the man just after releasing the block. What is the vertical reaction of both his skates on the ice during the throw? The man has a mass of 70 kg. Neglect friction...
11. Suppose you throw a ball vertically downward with a speed of 49 m/s What would be the speed of the ball one second later? 39 m/s. Show calculation: (g = 9.8 m/s) 49 m/s. ) 58.8 m/s. () 10 m/s. () 10 m/s2. 12. What distance will it have travelled after one second? Show calculation: 13. A rifle bullet is fired horizontally at the same instant another bullet is allowed to drop from rest at th Which bullet strikes...
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