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Problems with solutions
| I.D |
Level |
Problem |
Problem Topic |
| 45 |
High school |
A lever is used to lift a heavy load. When a 50N force pushes one end of the lever down 1.2m, the load rises 0.2 m.Calculate the weight of the load.
. . . continues
Click to Purchase Solution |
Simple machines |
| 46 |
High school |
A 60kg skydiver moving at terminal speed falls 50m in 1 sec. What power is the skydiver expending in air?
. . . continues
Click to Purchase Solution |
Work,Power & Energy |
| 47 |
High school |
A certain horse says, "There is no use trying to pull that cart. No matter how hard I pull on cart, -it will always pull back on me with exactly the same force. So I can never make it go , " Explain what is wrong with the horse's reasoning. (Free-body diagrams ,showing all the forces involved , will help ) . . . continues
Click to Purchase Solution |
Force & Laws of Motion |
| 48 |
High school |
A bicycle and rider together weigh 186 lbs . when moving at 10 mi/hr on a level road, the rider ceases to pedal and observes that she comes to a stop after traveling 200 yds.
a) How much work was done by the frictional force ?
b) What was the average frictional force resisting her motion ?
. . . continues
Click to Purchase Solution |
Force & Laws of Motion |
| 49 |
High school |
A 15 gram bullet is fired into a 10 kg wounded box which is mounted on small, frictionless wheels. Before the shot, the block is at rest. After the bullet hits the block, the combination of the two masses travels 45 cm in 1 second.
a) Calculate the velocity of the bullet before it hits the block.
b) . . . continues
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Force & Laws of Motion |
| 50 |
High school |
A gong is suspended by two ropes . One makes an angle of 25 degrees with the vertical and is under tension of 70 N . The other rope makes an angle of 40 degrees with the vertical. Find the mass of the gong and the tension in the second rope ? . . . continues
Click to Purchase Solution |
Force & Laws of Motion |
| 51 |
High school |
A bullet of mass 100 g is fired horizontally into a 14.9 kg block of wood resting on a horizontal surface, with the bullet becoming embedded in the block. If the muzzle velocity of the bullet is 250 m/s , what is the velocity of the block containing the bullet immediately after the collision ? If the coefficient of the friction . . . continues
Click to Purchase Solution |
Force & Laws of Motion |
| 52 |
High school |
Consider a 22 caliber bullet, a large cruise ship, and an iceberg. Assuming each to move at its normal speed, which has the greatest linear momentum ? Begin by estimating the mass and the speed of each. . . . continues
Click to Purchase Solution |
Force & Laws of Motion |
| 53 |
High school |
A hockey layer pushes a puck (M= 0.25 kg) initially at rest, with a constant force of 6.0N parallel to the ice. The force acts through a distance of 0.50m. Find the kinetic energy of the puck as it leaves the stick. How much work is required to bring the puck to rest ? what impulse does the hockey stick impart to the puck ? . . . continues
Click to Purchase Solution |
Force & Laws of Motion |
| 54 |
High school |
A child whose weight is 287 N slides down a 6.6 m playground slide that makes an angle of 41 degree with the horizontal. The coefficient of the kinetic friction between slide and child is 0.86.
(a) How much energy is transferred to the thermal energy ?
(b) If she start at the top wi . . . continues
Click to Purchase Solution |
Force & Laws of Motion |
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