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A mover's dolly is used to deliver a refriger- ator up a ramp into a house. The refrigerator has a mass of 143 kg. The ramp is 3 m long and rises 0.45 m . The mover pulls the dolly with constant velocity and with a steady force of 535 N up the ramp. The dolly and ramp constitute a machine. The acceleration of gravity is 9.8 m/s2 . What work does the mover do? Answer in units of J.
What gravitational potential energy is gained by the refrigerator?Answer in units of J.
What is the efficiency of the machine? Answer in units of percent.
How fast must the car be travelling just as it leaves the cliff in order to clear the river and land safely on the opposite side.
Find out the normal force exerted on the crate by the elevator.
A current of 18 Ampere runs through the Parallel Wire Apparatus. What is the anticipated mass (in milligrams) for balancing the frame-balance
A sample containing beryllium (atomic mass 9 u), aluminum (27 u), and an unknown element is placed in a mass spectrometer. What is the mass of the unknown element
A 1.3-µF capacitor is connected to a 4.7-V battery. What is the magnitude of the charge on each plate?
Each is afraid that one vine will break; as a result they grab each other and hang on. They swing upward together, reaching a point where the vines make an angle of 22.1° with the vertical. Find the value of the ratio m/M.
The Mars rover was deployed on the surface of Mars in July 1997. At one point during its subsequent mission, How far was Mars from the from Earth at that time
A high-speed flywheel in a motor is spinning at 450 rpm when a power failure suddenly occurs. The flywheel has mass 37.0kg and diameter 71 cm. The power is off for 27.0s and during this time the flywheel slows due to friction in its axle bearings...
A string of 22 identical Christmas tree lights are connected in series to a 125 V source. The string dissipates 52 W. What is the comparable resistance of the light string.
The resultant displacement has a magnitude of 170 cm and is directed at an angle of 65.0° to the positive x axis. Find out the magnitude and direction of the second displacement.
How long does it take for amplitude to drop to half its initial value . How long does it take for mechanical energy to drop to half its initial value.
In the bohr model of the hydrogen atom, an electron is the 6th excited state moves at a speed of 60km/s in a circular path having a radius of 2mm.
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