You are driving in your car with a sack of groceries in the seat next to you. You see a light change and you slow down and the sack remains on the seat. Suddenly the car in front of you slams on the brakes, and you are forced to brake harder
The groceries slide off the seat. Explain what happened.
At the lower deceleration the frictional force required to decelerate the sack of groceries was below the maximum static friction between the sack and the seat, but at the higher deceleration the frictional force was not sufficient, so the sack slid.
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The Sun is on the celestial equator at the times of the
a. vernal equinox and the summer solstice. b. autumnal equinox and the vernal equinox. c. summer solstice and the winter solstice. d. autumnal equinox and the winter solstice. e. Sun is on the ecliptic and is never on the celestial equator.
A 2 kg ball is floating in water. The volume displaced by the ball is
A. 0.005 
B. 0.004
C. 0.003
D. 0.002
E. 0.001
Pluto is no longer classified as a planet
Indicate whether the statement is true or false
Fusion is used to produce the largest nuclei known to exist
Indicate whether the statement is true or false