A ball thrown upwards reaches a maximum height and then comes back down to the original level. As the ball is going upwards the velocity and acceleration both point up
a. True
b. False
Indicate whether the statement is true or false
False
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Doppler Effect: You are driving along a highway at 25.0 m/s when you hear the siren of an emergency vehicle traveling at constant speed in the opposite direction on the other side of the highway. When the vehicle is approaching you, you hear the frequency of the siren as 2380 Hz, but when it is past you the frequency becomes 1680 Hz. What is the frequency of the siren? The speed of sound in air is 343 m/s.
A. 1850 Hz B. 2000 Hz C. 2050 Hz D. 2010 Hz E. 1980 Hz
A driver, traveling at 22. m/s, slows down her 1500. kg car to stop for a red light. What work is done by the friction force against the wheels?
What will be an ideal response?
Four identical particles (mass of each = 0.24 kg) are placed at the vertices of a rectangle (2.0 m × 3.0 m) and held in those positions by four light rods which form the sides of the rectangle. What is the rotational inertia of this rigid body about an axis that passes through the center of mass of the body and is parallel to the shorter sides of the rectangle?
A. 2.4 kg?m2 B. 2.2 kg?m2 C. 1.9 kg?m2 D. 2.7 kg?m2 E. 8.6 kg?m2
Some minerals glow when illuminated with ultraviolet light because
A) ultraviolet photons boost atomic electrons in the mineral to higher energy states. B) ultraviolet photons have high energy. C) of selective reflection. D) of selective transmission. E) none of the above