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A box of textbooks of mass 25.3kg rests on a loading ramp that makes an angle a with the horizontal. The coefficient of kinetic friction is 0.25 and the coefficient of static friction is 0.37.
As the angle a is increased, find the minimum angle at which the box starts to slip.
At this angle, find the acceleration once the box has begun to move.
At this angle, how fast will the box be moving after it has slid a distance 5.2m along the loading ramp?
A 91 g arrow is fired from a bow whose string exerts an average force of 115 N on the arrow over a distance of 78 cm. Illustrate what is the speed of the arrow as it leaves the bow?
In a different car, the distance the dummy moves while being stopped is reduced from 0.750 m to 0.270 m, calculate the average force on the dummy as that car stops
A celebrity holds a press conference, which is televised live. A television viewer hears the sound picked up by a microphone directly in front of the celebrity, determine the maximum distance between the television viewer and the celebrity
A tennis ball is shot out of a tennis practice machine at an angle of 18 upwards of the horizontal, at a speed of 20 m sec??1, from a height of 0.5 metre. at what height above ground would the ball be struck
An electron remains in an excited state of an atom for typically 10-8 s. What is the minimum uncertainty in the energy of the state
Police determine skid marks 83 m long on the highway showing where the car made an emergency stop. Assume that the acceleration was -10 m/s2 (about the highest for dry pavement), how fast was the car going.
A student throws a set of keys vertically upward to her sister in a window 4.0 m above. The keys are caught 1.5 s later by the sister’s outstretched h&. Find initial speed were the keys thrown?
Most of us know intuitively that in a head-on collision between a large dump truck and a subcompact car, you are better off being in the truck than in the car. Why is this, find the average force on the truck driver from the seatbelt
A camera has a lens with a focal length of 25.6 cm. how far from the film should the lens be placed
Wile E. Coyote and the Roadrunner are fictional cartoon characters. The premise of the cartoon is that Wile E. Coyote unsuccessfully tries to catch the very fast and clever Roadrunner. What is the momentum of the second wagon after the collision
A squirrel is resting in a tall tree when it slips from a branch that is 44 m above the ground. What is the height of the branch it lands on
A Ball begins rolling at the left and has just suffient energy to climb up to point C, which is the top of the hill on the right
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