Compare the kinetic energy of two balls: ball 1: mass m thrown with speed 2v ball 2: mass 2m thrown with speed v
A. KE1 = 4KE2 B. KE1 = KE2 C. 2KE1 = KE2 D. KE1 = 2KE2
D. KE1 = 2KE2
KE1 = ½ m(2v)2
KE2 = ½ 2m(v)2
= ½ mv2(4)
= ½ mv2(2)
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Shear Modulus: A 25-kg television set rests on four rubber pads, each one having a height of 1.0 cm and a radius of 0.60 cm. A 200-N horizontal force is applied to the television set. How far does it move sideways due to the deformation of the rubber pads if the pads do not slide on the floor? The shear modulus of these rubber pads is 2.6 × 106 Pa.
A. 6.8 mm B. 3.4 mm C. 1.7 mm D. 1.5 mm E. 1.3 mm
In 1975 the roof of Montreal's Velodrome, with a weight of 360 kN, was lifted by 10 cm so that it could be centered. How much work was done on the roof by the forces making the lift? In 1960 Mrs. Maxwell Rogers of Tampa, Florida, reportedly raised one end of a car that had fallen onto her son when a jack failed. If her panic lift effectively raised 4000 N (about 1/4 of the car's weight) by 5.0 cm, how much work did her force do on the car?
What will be an ideal response?
Which of the following factors was very important to the decision to classify Pluto as a dwarf planet rather than a "regular" planet?
A) its small size and mass B) its large distance from the Sun C) its composition of ice and rock D) its relatively large moon, Charon
If atmospheric pressure increases by an amount ?p, which of the following statements about the pressure in a lake is true? (There could be more than one correct choice.)
A) The absolute (total) pressure does not change. B) The gauge pressure increases by ?p. C) The absolute (total) pressure increases by ?p. D) The absolute (total) pressure increases, but by an amount less than ?p. E) The gauge pressure does not change.