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Q. A 250 kg piano slides 4.5 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40. Calculate the work done by the man on the piano.
Q. During a hard sneeze, your eyes might shut for 0.50 s. If you are driving a car at 90 km/h during such a sneeze, how far does the car move during that time?
Find maximum height reached by the diver using the equation of motion.
A uniform plank of length 5.70 m and weight 215 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support. To what distance x can a person who weighs 452 N walk on the overhanging part of the plank before it just be..
A 430 microF capacitor is charged to 245 V. after that a wire is connected between the plates. How many joules of thermal energy are produced as capacitor discharges if all of the energy that was stored goes into heating the wire.
A 37-kg girl is bouncing on a trampoline. All through a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 215 J from 430 J. How high does she rise during this interval? Avoid air resistance.
A 57 kg student sits on a chair which is solely supported by a solid 1/2 meter long steel rod 1cm in diameter. To the nearest micron (millionth of a meter) what is the change in length of the rod produced by the student's weight.
To determine the location of her center of mass, a physics student lies on the lightweight plank supported by two scales 2.50 apart, as indicated . If left scale reads 300 , and right scale reads 122 .
An autographed baseball rolls off a 0.64m high desk and strikes the floor 0.61 m away from the desk. How fast was it rolling on the desk before it fell off? The acceleration of gravity is 9.80 m/s^2.
A cockroach of mass m lies on the rim of a uniform disk of mass 8m that can rotate freely about its center like a merry-go-round. at first the cockroach and disk rotate together with an angular velocity of 0.200 rad/s. Then the cockroach walks half..
A 50.0g silver spoon at 20.0c is placed in a cup of coffee at 90 c. How much heat does spoon absorb from the coffee to reach a temperature of 89c.
A 10 kg runaway grocery cart runs into a spring with spring constant 240N/m and compresses it by 65cm. What was the speed of the cart just before it hit the spring.
It is expected to measure an X-ray peak which occurs at an angle of around 31.6g. Alter viewing the scale and pointer, with what accuracy w ill you quote the result?
A 1300 N uniform boom is supported by a cable perpendicular to boom. The boom is hinged at the bottom, and a 2100N weight hangs from its top.
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