A 6.0-kg object is falling downward with an acceleration of 3.27 m/s2 . Of the following values, which is nearest to the drag force on the object?
a. 3.3N
c. 20 N
b. 65 N
d. 39 N
D
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The escape velocity needed for an atom in the atmosphere of a planet to escape the gravitational pull of the planet is smaller if:
a) the radius of the planet is smaller b) the planet is farther from the Sun c) the mass of the atom is larger d) the temperature of the gas in the atmosphere is lower e) the mass of the planet is smaller
Three kids pull on a toy. Kim pulls with a force of 30 N north, Jim pulls with a force of 30 N south, and Tim pulls with a force of 15 N east. The acceleration of the toy is
A) 10 m/s2. B) 15 m/s2. C) 33 m/s2 D) need more information
The greater the disturbance of the medium, the higher the amplitude of the wave
Indicate whether the statement is true or false
Which of these is the best explanation of the "electric hair" that can occur when some people brush their hair?
A) Excess electrons flow onto both the brush and the hair, causing the hairs to repel each other and causing the brush to repel the hairs. B) The atoms of the brush and hair are set into rapid vibration, causing them to emit electromagnetic waves, which causes the hairs to stand up. C) Electrons are brushed either from the hair onto the brush, or vice-versa, causing the brush and hair to be charged, so that the hairs then attract each other while the brush repels the hairs. D) The atoms of the brush and hair are heated, causing their electrons to move faster, which spreads out the atoms and thus causes the hairs to stand up. E) Electrons are brushed either from the hair onto the brush, or vice-versa, causing the brush and hair to be charged, so that the hairs then repel each other while the brush attracts the hairs.