A box is dropped onto a conveyor belt moving at 2 m/s. If the coefficient of friction between the box and the belt is 0.3, how long before the box moves without slipping?
0.7 s
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Predict the next panel in the spectral sequence of the binary star system shown above
a. a
b. c
c. b
d. None of the other choices are correct.
Energy and Mass: An alpha particle has a mass of 6.64 × 10-27 kg and a charge of 3.20 × 10-19 C, and it is traveling at 0.9650c. (c = 3.00 × 108 m/s), 1 eV = 1.60 × 10-19 J)(a) What is its rest energy (in GeV)?(b) What is its total energy (in GeV)?(c) What is its kinetic energy (in GeV)?
What will be an ideal response?
Why are Earth and other planets spherical while smaller bodies such as most asteroids are not?
A. The larger mass of a planet produces enough gravity to pull it into a round shape. B. It is the nature of massive objects to pull themselves into spherical shapes. C. Asteroids were never molten, and so never underwent differentiation. D. Earth and other planets formed from planetesimals pulled together by gravity into circular orbits. E. The atmosphere of a planet is heavy enough to push the planet into a round shape.
The surface water temperature on a large, deep lake is 3°C. A sensitive temperature probe is lowered several m into the lake. What temperature will the probe record?
A) a temperature warmer than 3°C B) a temperature less than 3°C C) a temperature equal to 3°C