A centrifuge takes 100 s to spin up from rest to its final angular speed with constant angular acceleration
. A point located 8.00 cm from the axis of rotation of the centrifuge moves with a speed of 150 m/s when the centrifuge is at full speed.
(a) What is the average angular acceleration of the centrifuge as it spins up?
(b) How many revolutions does the centrifuge make as it goes from rest to its final angular speed?
(a) 18.8 rad/s2
(b) 1.49 × 104 revolutions
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What is the acceleration of a car that starts from rest and 5 seconds later reaches a speed of 20 m/s?
A) 1 m/s2 B) 2 m/s2 C) 3 m/s2 D) 4 m/s2 E) 5 m/s2
A person on a sled coasts down a hill and then goes over a slight rise with speed 2.7 m/s. The top of this rise can be modeled as a circle of radius 4.1 m. The sled and occupant have a combined mass of 110 kg
If the coefficient of kinetic friction between the snow and the sled is 0.10, what friction force is exerted on the sled by the snow as the sled goes over the top of the rise?
Which of the following is not evidence supporting the idea that our Moon formed as a result of a giant impact?
A) The Pacific Ocean appears to be a large crater—probably the one made by the giant impact. B) The Moon has a much smaller proportion of easily vaporized materials than Earth. C) The Moon's average density suggests it is made of rock much more like that of the Earth's outer layers than that of the Earth as a whole. D) Computer simulations show that the Moon could really have formed in this way.
A ray of light is incident on the mid-point of a glass prism surface at an angle of 20° with the normal. For the glass, n = 1.60, and the prism apex angle is 40°. What is the angle of incidence at the glass-to-air surface on the side opposite where the ray exits the prism? The surfaces involved are those of the apex angle
a. 12.3° c. 22.7° b. 38.0° d. 27.7°