A hoop with a mass of 2.75 kg is rolling without slipping along a horizontal surface with a speed of 4.50 m/s when it starts down a ramp that makes an angle of 25.0° with the horizontal
What is the rotational kinetic energy of the hoop after it has rolled 3.00 m down the ramp? A) 34.2 J
B) 22.4 J
C) 44.9 J
D) 62.0 J
E) This question cannot be answered without knowing the radius of the hoop.
C
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A scale from which a rock is suspended reads 5 N when the rock is out of water and 3 N when the rock is submerged. The density of the rock is
A) the density of water. B) 1.5 times the density of water. C) 2.5 times the density of water. D) 3.5 times the density of water. E) none of the above
Polyethylene LCMs with long side branches results in _____________-density polyethylene.
Fill in the blank(s) with the appropriate word(s).
Gravitational Force: What is the distance from the center of the Moon to the point between Earth and the Moon where the gravitational pulls of Earth and Moon are equal? The mass of Earth is 5.97 × 1024 kg, the mass of the Moon is 7.35 × 1022 kg, the center-to-center distance between Earth and the Moon is 3.84 × 108 m, and G = 6.67 × 10-11 N ? m2/kg2.
A. 3.45 × 108 m B. 3.84 × 107 m C. 4.69 × 106 m D. 3.83 × 106 m E. 4.69 × 107 m
If a 5.0 kg box is pulled simultaneously by a 10.0 N force and a 5.0 N force, then its acceleration must be
A) 3.0 m/s2. B) 2.2 m/s2. C) 1.0 m/s2. D) We cannot tell from the information given.