Other Physics Answers

A hockey puck has a mass of 0.170 kg; a soccer ball has a mass of 0.425 kg; a baseball has a mass of 0.145 kg; and a tennis ball has a mass of 0.0575 kg. Suppose these objects were approaching your knee with the same velocity. Based on the most relevant quantity of motion, you would least likely need protection from the

A block of with a mass of 4.0 kg sitting in a frictionless horizontal table is connected to a hanging block of mass 6.0 kg by a string that passes over a pulley. Assuming that friction, the mass of the string, and the mass of the pulley are negligible, at what rate do the blocks accelerate.

V/2f=l2-l1

An ideal gas is a volume of 0.1m3 expand at the distance pressure of 1.5

An electric generator has e.m.f. of 240 V and an internal resistance of 1Ω if the current supplied by the generatoris 20A when the terminal voltage is 220 V, find the ratio of the power supplied to the power dissipated

A 20g piece of aluminum at 90◦ C is dropped into a cavity in a large

block of ice at 0◦ C. Calculate the mass of ice melted by the aluminum.

A 0.339 kg sample is placed in a cooling apparatus which removes energy as heat at a constant rate. The figure gives the temperature T of the sample versus time t (where the horizontal scale is set by t_s = 80.0 min). The sample freezes during the energy removal. T₁ = 309 K, T₂ = 274 K, T₃ = 216 K, and the specific heat of the sample in its initial, liquid phase is 3012 J/kg K.

A 90.5kg man standing on a surface of negligible friction kicks forward a 45gm stone lying at his feet so that it acquires a speed of 30.5m/s. What velocity does the man acquire as a result?

A force of 50N exerted over a distance of 3.0m causes a block having a mass of 20kg to move 1.0m find the AMA; the IMA; efficiency.

An object is pushed from rest across a sheet of ice, accelerating at 5.0 m/s² over a distance of 80.0 cm. The object then slides with a constant speed for 4.0 s until it reaches a rough section which causes it to stop in 2.5 s. (6 marks)

1. What is the speed of the object when it reaches the rough section?
2. At what rate does the object slow down once it reaches the rough section?
3. What total distance does the object slide throughout its entire trip?