Physics, 29.10.2020 01:00 kyra737

Three objects are sliding across the floor at the following speeds: Object A: 2 m/s
Object B: 4 m/s
Object C: 6 m/s
Ignoring air resistance and friction, rank these objects from greatest to least by the force needed to
keep them going

Answers: 3

Show answers

Another question on Physics

Physics, 22.06.2019 00:00

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Answers: 2

Answer

Physics, 22.06.2019 12:00

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

Answers: 1

Answer

Physics, 23.06.2019 01:30

Amerry-go-round of radius r, shown in the figure, is rotating at constant angular speed. the friction in its bearings is so small that it can be ignored. a sandbag of mass m is dropped onto the merry-go-round, at a position designated by r. the sandbag does not slip or roll upon contact with the merry-go-round. how would you rank the following different combinations of m and r on the basis of the angular speed of the merry-go-round after the sandbag "sticks" to the merry-go-round from largest to smallest. a) m = 10kg, r = 0.25r b) m = 20kg, r = 0.25r c) m = 10kg, r = 0.50r d) m = 10kg, r = 1.0r e) m = 15kg, r = 0.75r f) m = 40kg, r = 0.25r

Answers: 1

Answer

Physics, 23.06.2019 08:00

Athin electrical heater is inserted between a long circular rod and a concentric tube with inner and outer radii of 20 and 40 mm. the rod (a) has a thermal conductivity of ka = 0.15 w/(m*k), while the tube (b) has a thermal conductivity of kb = 0.8 w/(m*k) and its outer surface is subjected to convection with a fluid of temperature t= -15°c and heat transfer coefficient 60 w/(m2 *k). the thermal contact resistance between the cylinder surfaces and the heater is negligible. (a) determine the electrical power per unit length of the cylinders (w/m) that is required to maintain the outer surface of cylinder b at 15°c. (b) what is the temperature at the center of cylinder a?

Answers: 2

Answer

You know the right answer?

Three objects are sliding across the floor at the following speeds: Object A: 2 m/s
Object B:...

Questions