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A 45% efficient device uses chemical energy to generate 420 J of electric energy.
How much chemical energy is used?
A second device uses twice much chemical energy to generate half as much electric energy. What is its efficiency?
A 75 kg block is being pulled up a 25 degree slope by a force of 200N which is parallel to the slope. What is the acceleration of the block
Standing waves on a 1.7m -long string that is fixed at both ends are seen at successive frequencies of 36 Hz and 54Hz. What is the fundamental frequency
Suppose wire A and wire B are made of different metals, and are subjected to the same electric field in two different circuits. How many electrons enter wire B every second
An accelerator produces a beam of protons with a circular cross section that is 2.0 mm in diameter and has a current of1.1 mA. What is the number density of the protons in the beam
What was the arrow's initial speed. A small sphere with a mass of 2.00×10^-3g and carrying the charge of 4.80×10^-8C hangs from a thread near a very large, charged insulating sheet. The charge density on the sheet is -2.90×10^-9C/m^2 .
Water is in the big beaker in the figure on the left. Scale 1 reads 96 newtons, scale 2 reads 531 newtons, and scale 3 reads 0 newtons. The hanging block has a density of 10 × 10^3 kg/m3. To nearest tenth of a newton what does scale 1 read after t..
A 120 g insulated aluminum cup at 17 C is filled with 140 g of water at 40 C. After a few minutes, equilibrium is reached. A)Determine the final temperature. B)Estimate the total change in entropy.
The drill bit of a variable-speed electric drill has a constant angular acceleration of 5.65 rad/s2. The initial angular speed of the bit is 6.56 rad/s. what angle has the bit turned through
Find the change in entropy in the universe. Now, two identical ideal oxygen gases with the same pressure P=1 atm and the same number of particles N = 10^22, but di erent temperature T1 = 30 C and T2 = 40 C,
Compared to an object that does not roll, other than instead slides without friction, should a rolling object be released from same, a greater, or a lesser height in order just barely to complete the loop the loop.
A girl throws a ball at a vertical wall 4 m away. The ball is2 m above the ground when it leaves the girl's hand with an initialvelocit of Vo= (10i+10j) m/s. Where does the ball hit the ground
Three point charges, A = 1.80 µC, B = 7.50 µC, and C = -3.80 µC, are located at the corners of an equilateral triangle, Find the magnitude (N/C) at point A, and the direction in degrees counterclockwise from the positive x-axis
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