An object travels in a circle of radius 2.0 m with a constant speed of 4.0 m/s. What is the direction of its acceleration?
a. Toward the center of the circle
b. Normal to the plane of the circle
c. Insufficient data given for determination
d. Tangential to the circle
e. None of these
a
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A ball rolls over the edge of a table with a horizontal velocity v m/s. The height of the table is 1.6 m and the horizontal range of the ball from the base of the table is 20 m
What is the horizontal velocity of the ball just before it touches the ground? A) 35 m/s B) 9.8 m/s C) 20 m/s D) 4.9 m/s E) 70 m/s
The reason the north pole of a bar magnet free to rotate points north is because
a. the south geographic pole of the earth is the earth's magnetic north pole. b. the south geographic pole of the earth is the earth's magnetic south pole. c. there is a net accumulation of negative magnetic charge at the earth's south geographic pole. d. there is a net accumulation of positive magnetic charge at the earth's north geographic pole. e. the north geographic pole of the earth is the earth's magnetic north pole.
Why is Venusian lava less viscous than Earth's?
A. There is more water in Earth's lava. B. Earth's rapid rotation stirs its lava, making it thinner. C. Earth's surface has a lower temperature. D. Atmospheric pressure on Venus is much higher than on Earth.
What particle carries the strong force?
A.) Graviton. B.) W boson. C.) Z boson. D.) Gluon. E.) Photon.