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1. What force is required to drag a sack of rice weighing 105 lb if the coefficient of friction is 0.25?
(a) when the force is parallel to the surface,
(b) when the force makes 37° above the horizontal.
2. A piano weighing 600 lb is to be raised to a platform 4 ft high through a plank 10 ft long. If the coefficient of friction is 0.30, what force parallel to the plank will be needed?
A battery's ideal voltage is 12.0 V; its internal resistance is 1.46 ohms. If the battery is attached in series to a 21.5-ohms resistor, what is the actual voltage supplied by the battery?
Through what potential difference must an electron be accelerated from rest to have a de Broglie wavelength of 700nm
Between each pair of vertebrae in the spinal column is a cylindrical disc of cartilage. How far does the top surface move relative to the bottom surface
Illustrate what are the distinguishing characteristics of the EMTN and explain why it is such a popular form of financing for MNEs?
A 1200 kilogram car traveling north at 14 meter per second is rear ended by a 2000 kilogram truck traveling at 25 m/s. If the truck and car lock bumpers and stick together find what is their speed immediately after the collision
The planet Mercury has a mass that is 5.00% of that of Earth, and its gravitational acceleration is gmercury = 3.70 m/s2.From what height would you have to drop the rock on Earth so that the fall-time on both planets is the same?
A projectile is fired vertically from Earth's surface with an initial speed of 9.6 km/s. Neglecting air drag, how far above the surface of Earth will it go
Refer to Conceptual Example 8 as background material for this problem. The drawing shows a horizontal beam of light that is incident on a prism. The base of the prism is also horizontal. The prism (n = 1.20) is surrounded by a liquid whose index of r..
A 52 kg woman and a 70 kg man stand 20.0 m apart on frictionless ice. How far from the man is their center of mass (CM)? If each holds one end of a rope, and the man pulls on the rope so that he moves 2.4 m, then how far from the woman will he be now..
How much work the power plant produces in a day. How much energy is discarded to low temperature source in a day.
The electromagnetic waves utilized in a microwave oven have a wave length of 12.24 cm. What is the frequency of this radiation?
A plastic film of thickness 290 nm appears to be green (?green = 510 nm), What is the plastic's index of refraction
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