A racecar driver steps on the gas, changing his speed from 10 m/s to 30 m/s in 4 seconds. The acceleration of the racecar is 10 m/s2
a. True
b. False
Indicate whether the statement is true or false
False
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A river flows toward the East at 1.5 m/s. Steve can swim 2.2 m/s in still water. If he wishes to cross the river so that his direction is northward, what direction relative to the water must he swim?
a. 
b. 
c. 
d. 
The pressure at the bottom of a glass filled with water (? = 1 000 kg/m3) is P. The water is poured out and the glass is filled with ethyl alcohol (? = 806 kg/m3). The pressure at the bottom of the glass is now
1.smaller than P. 2.equal to P. 3.larger than P. 4.indeterminate.
A 6.0 ? and a 12. ? resistor are connected in series to a 36. V battery. What power is dissipated by the 12.0 ? resistor?
A) 216. W B) 486. W C) 12. W D) 24. W E) 48. W
Multiple-Object Accelerating Systems: As shown in the figure, a 10-kg block on a perfectly smooth horizontal table is connected by a horizontal string to a 63-kg block that is hanging over the edge of the table. What is the magnitude of the acceleration of the 10-kg block when the other block is gently released?
A. 8.5 m/s2 B. 8.1 m/s2 C. 7.5 m/s2 D. 9.0 m/s2