Physics, 17.08.2019 17:10 smallblueberry
Aball is thrown straight up. what can be said about the sign of work done by the force exerted by gravity while the ball moves up and then down?
a) positive as the ball travels up, and positive as the ball travels down
b) zero as the ball travels up, and zero as the ball travels down
c) negative as the ball travels up, and negative as the ball travels down
d) positive as the ball travels up, and negative as the ball travels down
e) negative 'as the ball travels up, and positive as the ball travels down
Answers: 1
Physics, 22.06.2019 05:00
Aperson standing in a canoe exerts a force of 700 n to throw an anchor over the side. find the acceleration of the canoe if the total mass of the canoe and the person is 100 kg?
Answers: 1
Physics, 22.06.2019 13:40
An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40ยฐc, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.
Answers: 2
Physics, 22.06.2019 18:50
An insulated thermos contains 148 g of water at 72.7 หc. you put in a 11.7 g ice cube at 0.00 หc to form a system of ice + original water. the specific heat of liquid water is 4190 j/kgโขk; and the heat of fusion of water is 333 kj/kg. what is the net entropy change of the system from then until the system reaches the final (equilibrium) temperature?
Answers: 2
Physics, 22.06.2019 19:50
An air-filled capacitor is formed from two long conducting cylindrical shells that are coaxial and have radii of 26 mm and 103 mm. the electric potential of the inner conductor with respect to the outer conductor is - 700 v (k = 1/4ฯฮต 0 = 8.99 ร 109 n ยท m2/c2) the energy stored in a 1.0-m length of this capacitor is closest to
Answers: 1
Aball is thrown straight up. what can be said about the sign of work done by the force exerted by gr...
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