The only force acting on a 2.0-kg body as it moves along the x axis is given by Fx = (12 - 2.0x) N, where x is in m. The velocity of the body at x = 2.0 m is 5.5 m/s. What is the maximum kinetic energy attained by the body while moving in the +x direction?
a. 36 J
b. 39 J
c. 43 J
d. 46 J
e. 30 J
D
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A force of 451 N is applied to 111 kg box that has a coefficient of static friction of 0.450. What is the force of friction on the box?
A. 490 N B. 0.00 N C. 108 N D. 451 N E. 203 N
The Kepler mission searches for Earth-like planets by looking for the dip in the brightness of a star as such a planet transited across it. Why does this technique actually miss the vast majority of planets?
What will be an ideal response?
For a 0.1-kg frog to jump to a height of 1.0 meter requires an energy of about
A. 0.1 Joule. B. 0.5 Joule. C. 1.0 Joule. D. 10 Joule.
An electron is placed in a uniform electric field of 4.5 × 104 N/C that points to the right. (e = 1.6 × 10-19 C, melectron = 9.11 × 10-31 kg)
(a) What are the magnitude and direction of the force on the electron? (b) If the electron is released from rest, what is its speed after 3.0 ps?