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Sam pushes a 10.0-kg sack of bread flour on a frictionless horizontal surface with a constant horizontal force of 4.0 N starting from rest.
(a) What is the kinetic energy of the sack after Sam has pushed it a distance of 20 cm?
(b) What is the speed of the sack after Sam has pushed it a distance of 20 cm?
A body cools from 50 degre celcious to 49 degree celcious in 5 seconds. Hw long would it take to cool from 40 degree celcious to 39 degree celcious.
The acceleration of gravity is 9.81 m/s^2. Assuming that air resistance is simply a constant 96 N force on the person during the fall, identify the person's velocity just before hitting the net. Answer in units of m/s.
a 90 ohm resistor has a current of .6A and is connect in series with a 150 ohm resistor. What is the emf of the battery to which the resistors are connected
A concave mirror produces a virtual image that is three times as tall as the object. what is the radius of curvature of this mirror
An athlete completed a marathon in 2 h, 39 min, 41 s. Determine the average speed (in miles per hour) of the athlete.
question1a ball drops from rest from an unknown height h. the time it takes for the ball to hit the ground is measured
In a crash test, a 1100 kg car slams into a concrete wall at 17.1 m/s and comes to rest in 0.275 s. a)Find out the magnitude of the impulse delivered to the car.b) Find the average stopping force.
A box with mass 7.0 kg is sliding down a frictionless ramp that is 2.6 m long and inclined at 33 deg. above the horizontal. how long will it take to reach the bottom of the ramp
A thin layer of oil (n=1.25) is floating on water (n=1.33). What is the minimum non zero thickness of the oil in the region
For a string stretched between two supports, two successive standing-wave frequencies are 505Hz and 630Hz . There are other standing-wave frequencies lower than 505Hz and higher than 630Hz.
A 22 child slides down a 2.4 -high playground slide. She starts from rest, and her speed at the bottom is 1.9 What is the change in thermal energy of the seat of her pants?
Zach, whose mass is 55kg , is in an elevator descending at 14m/s. What is Zach's apparent weight while the elevator is braking
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