A 2.00 kg mass is moving in a circular path with a radius of 5.00 cm. The mass starts from rest and with constant angular acceleration, obtains an angular velocity of 6.00 rad/sec in 3.00 sec. The mass then comes to a stop with constant deceleration in 4.00 sec. The centripetal component of acceleration of the mass at 2.00 sec is
A. 1.220 
B. 0.980
C. 0.806
D. 0.656
E. 0.520
C. 0.806
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A stone is dropped from a certain height and penetrates into mud. All else being equal, if it is dropped from twice the height, how much farther should it penetrate?
a) Four times as far b) The same distance c) Twice as far d) Three times as far
A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27 cm and a frequency of 2.55 Hz
(a) What is the maximum speed of the needle? (b) What is the maximum acceleration of the needle? What will be an ideal response?
A convex mirror has a focal length of ?20 cm. What is the object distance if the image distance is ?10 cm?
a. 10 cm b. 40 cm c. 60 cm d. 20 cm e. 30 cm
In an isothermal process, there is no change in
A) pressure. B) temperature. C) volume. D) heat. E) internal energy.