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Starting from rest, a 1.8 10-4-kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.37 N on it. This force does +2.6 10-4 J of work on the flea.
(a) What is the flea's speed when it leaves the ground?
m/s
(b) How far upward does the flea move while it is pushing off? Ignore both air resistance and the flea's weight.
m
A ramp is 25 meters long and is inclined at 30 degrees with the horizontal. A block of mass 25 is pulled up at a constant acceleration of 1 m/s2. The coefficient of kinetic friction is 0.15. If the box starts at rest from the bottom, what would be..
the horizontal and the chair slides along the floor. Using Newton's laws, compute the magnitude of the normal force that the floor exerts on the chair.
A spherical balloon is partially blown up and its surface area is measured. More air is then added, increasing the volume of the balloon. If the surface area of the balloon expands by a factor of 6.7 during this procedure, by what factor does the ..
A parallel-plate capacitor has fixed charges +Q and -Q. The separation of the plates is then doubled. (a) By what factor does the energy stored in the electric field change? (b) How much work must be done in doubling the plate separation from d to..
A steel beam that is 7.00m long weighs 330N. It rests on two supports, 3.00m apart, with equal amounts of beam extending from each end. Suki, who weighs 505 N, stands on the beam in the center and then walks toward one end. How close to the end can s..
A space station, in the form of a wheel 184 m in diameter, rotates to provide an "artificial gravity" of 7.40 m/s2 for persons who walk around on the outer rim. Find the rotational frequency of wheel (in revolutions per minute) that will produce t..
What is speed of the second train, which travels faster
Dan is gliding on his skateboard at 2.00m/s. He rapidly jumps backward off the skateboard, kicking the skateboard forward at 8.00m/s (as measured by an observer on the ground). Dan's mass is 60.0kg and the skateboard's mass is 7.00kg.
An airplane is flying with a velocity of 91at an angle of 26 above the horizontal. When the plane is a distance 107 directly above a dog that is standing on level ground, a suitcase drops out of luggage compartment.
Sherlock Holmes examines a clue by holding his magnifying glass (with a focal length of 15.0 cm) 10.0 cm away from an object. Find the image distance and the magnification. explain the image that he observes.
A 2.00 m tall basketball player wants to make a goal from 10.0 m from the basket. If he shoots the ball at a 45.0° angle, at what initial speed should he throw the basketball so that it goes through the hoop without striking the backboard.
A 240g ball and a 130g ball are connected by a 32 cm-long massless, rigid rod. The structure rotates about its center of mass at 150rpm.
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