A 1200 W toaster does enough work in 10 seconds to raise an 80 kg man to a height of 15 meters
What will be an ideal response?
To raise an 80 kg man 15 meters takes 80 kg x 10 m/s2 x 15 m = 12,000 J of
work. In 10 s the 1200 W toaster does 1200 W x 10 s = 12.000 J of work. These are the
same, so the statement is true.
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A student releases a ball from rest on an inclined plane and measures that it travels a distance of 0.8 m in a time of 4.0 s. The average speed of the ball is
A. 1.0 m/s. B. 3.2 m/s. C. 0.2 m/s. D. 2.0 m/s.
The figure shows a block on an inclined plane
What is the expression for the normal force acting on the block?
a.
?Mg
b.
?Mgcos?
c.
?Mgsin?
d.
?Mgtan?
How many arcseconds are in 1 arcminute?
A) 60 B) 360 C) 3600 D) 100 E) 10,000
A woman drives 75 m to the east. She stops, asks directions, and then drives 75 m to north. What is the direction of the displacement with respect to east?
a. 30 b. 53 c. 0 d. 45