Rita accelerates a 0.40-kg ball from rest to 12 m/s during the 0.15 s in which her foot is in contact with the ball. What average force does she apply to the ball during the kick?
a. 48 N
c. 24 N
b. 32 N
d. 64 N
B
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Suppose it is full moon. What phase of Earth would someone on the Moon see at this time?
A) full Earth B) new Earth C) first-quarter Earth D) Earth does not go through phases as seen from the Moon.
A far-sighted student has a near point of 1.0 m. Calculate the focal length (in cm) of the glasses needed so the near point will be normal (25 cm)
a. 72 b. 25 c. 33 d. 100 e. -33
A 4.0-kg mass, initially at rest on a horizontal frictionless surface, is struck by a 2.0-kg mass moving along the x axis with a speed of 8.0 m/s. After the collision, the 2.0-kg mass has a speed of 4.0 m/s at an angle of 37° from the positive x axis. What is the speed of the 4.0-kg mass after the collision?
a. 2.0 m/s b. 2.7 m/s c. 4.9 m/s d. 2.4 m/s e. 3.6 m/s
A pipe of diameter 4 cm is replaced by one of the same length but of diameter 5 cm. If the pressure difference between the ends of the pipe remains the same, by what factor is the rate of flow of a viscous liquid through it changed?
a. 5.1 c. 2.4 b. 3.4 d. 1.5