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A liquid is irregularly stirred in a well-insulated container and thereby experiences a rise in temperature. If the system is the liquid:(a) Has heat been transferred?
(b) Has work been done?
(c) What is the sign of ?U?
Calculate the number of coulombs of positive charge in 270 cm3 of (neutral) water. (Hint: A hydrogen atom contains one proton and an oxygen atom contains eight protons.) I keep getting 1.4E7 and its showing up wrong.
A 70-kg astronaut is space-walking outside the space capsule and is stationary when the tether line breaks. As a means of returning to the capsule he throws his 2.0-kg space hammer at a speed of 14 m/s away from the capsule.
A basketball player shoots a 0.75-kg ball into a basket by shooting the ball with an initial speed of 12 m/s at an angle of 60 above the horizontal. The basket is three meters o the ground and the ball leaves her hand at a height of 1.4 meters above ..
The population density of Los Angeles is about 4000 people/km2.That of San Francisco is about 6000 people/km2. How many times farther away is the average person's nearest neighbor in LA than inSan Francisco? The answer is not 1.5.
a man and a boy are carrying a uniform wooden beam that is 8 m long and weighs 900 n. the boy lifts at one end. at
A cafeteria tray dispenser supports a stack of trays on a shelf hangs from four identical spiral springs under tension, one near each corner of the shelf. Each tray is rectangular, 45.3 cm by 35.6cm, 0.450 cm thick, and with mass 580g. Demonstrate..
A rifle with a weight of 35 N fires a 5.5 g bullet with a speed of 200 m/s. If a 725 N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle
Light of wavelength 502 nm falls on a diffraction grating whose spacing is 1560 nm. What is the largest order spectrum which can be observed
An object undergoing parabolic motion travels
The wing of an airplane has an average cross-sectional area of 13 m2 and experiences a lift force of 84,000 N. What is the average difference in the air pressure
A horizontal force of magnitude 36.4 N pushes a block of mass3.81 kg across a floor where the coefficient of kinetic friction is0.640. What is the increase in the kineticenergy of the block
A long, thin, massless rod of length L rotates in a vertical plane about a frictionless pivot point. Find the speed of the mass at the bottom of the swing
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