Does the centripetal force acting on an object do work on the object?
A) no, because the object has constant speed
B) yes, since it takes energy to turn an object
C) yes, since a force acts and the object moves, and work is force times distance
D) no, because the force and the displacement of the object are perpendicular
E) yes, because the force and the displacement of the object are perpendicular
D
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Constant Acceleration Kinematics: A train starts from rest and accelerates uniformly until it has traveled 5.6 km and acquired a forward velocity of 42 m/s. The train then moves at a constant velocity of 42 m/s for 420 s. The train then slows down uniformly at 0.065 m/s2, until it is brought to a halt. The acceleration during the first 5.6 km of travel is closest to which of the following?
A. 0.16 m/s2 B. 0.14 m/s2 C. 0.17 m/s2 D. 0.19 m/s2 E. 0.20 m/s2
The astronomical object in our sky which plays the most fundamental role in our lives is the
A) Sun B) Moon C) nearest star D) most massive planet in our solar system, Jupiter
The first scientific attempt to map the Milky Way galaxy
a. showed that the Sun was located in the center of the system of planets making up our galaxy. b. showed that our galaxy is a round ball on which we live. c. showed that our galaxy has 9 stars. d. used globular clusters to determine the location of the center of the Earth. e. was completed by William and Caroline Herschel.
Carnot Engine: An ideal Carnot engine operating between a warm reservoir of unknown temperature and a cold reservoir at 1.76 K has an efficiency of 40.0%. What is the temperature of the warm reservoir?
A. 2.93 K B. 0.0500 K C. 106 K D. 0.0400 K