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A 10 kilogram lead ball is dropped from a height of 30 m and it hits the floor at a speed of 20 m/s. Suppose the ball is released from rest. Find how much mechanical energy is lost to air resistance?
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a 3.5kg block is accelerated by a (horizontally) compressedspring whose spring constant is 640 N/m. What is the maximum kinetic energy of the block
A speedboat moving at 33.0 m/s approaches a no-wake buoy marker 100 m ahead. The pilot slows the boat with a constant acceleration of ?3.20 m/s2 by reducing the throttle. (a) How long does it take the boat to reach the buoy? (b) Find the total tim..
Connections to the body for electrocardiography (ECG) and electroencephalography (EEG) are normally made with metal electrodes and conductive gels to ensure good electrical contact. Whats the minimum electrode capacitance
An open train car, with a mass of 2210 kg, coasts along a horizontal track at the speed 2.47 m/s. What is the car's speed after the loading is completed
An artillery shell is fired at an angle of 63.8 above the horizontal ground with an initial speed of 2000 m/s. Find the total time of flight of the shell
Find the radius of an electron's orbit when it moves perpendicular to a magnetic field of 0.56 with a speed of 6.29×10^5 m/s
a glass rod is rubbed with silk and acquires a charge of magnitude 7.50 nc. what is the change in mass of rod?also if
A 51-g handball moving with a speed of5 m/s strikes the wall at an angle of37° with the normal, and then bounces off with the same speed at the similar angle by the normal. It is in contact by the wall for 2.0 ms. what is the average force exerted by..
A brick is initially 7.72 cm high and an aluminum can is initially 7.73 cm high. By how much should their temperatures be raised in order for the brick and the can to have precisely the similar height?
An irregularly shaped object 10 m long is placed with each end on ascale. If the scale on the right reads 74 N and the scale on the left reads 93 N, how far from the left is the center of gravity?
A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting force does work in raising the helicopter. What is the average power generated by the lifting force
Find out the total work done on the car by the external forces.
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