A block is on a frictionless horizontal table, on earth. This block accelerates at 3.6 m/s2 when a 90 N horizontal force is applied to it. The block and table are then set up on the moon where the acceleration due to gravity is 1.62 m/s2
A horizontal force of 45 N is applied to the block when it is on the moon. What acceleration does this force impart to the block? A) 1.8 m/s2
B) 1.6 m/s2
C) 2.0 m/s2
D) 2.2 m/s2
E) 2.3 m/s2
A
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Galileo proposed that the Sun is a rotating sphere after he ____
a. noted how the Sun rose in the east and set in the west b. discovered the parallax of the Sun c. timed a full rotation of the Sun's equator d. observed sunspots move across the surface of the Sun e. measured different spectral lines of emission on different days
Match the words in the left-hand column to the appropriate blank in the sentences in the right-hand column. Use each word only once.
The side mirror on a car is convex and has a radius of curvature of 25 cm. Another car is following, 20 m behind the mirror. If the height of the car is 1.6 m, how tall is the image?
A) 5 cm B) 2 cm C) 4 cm D) 3 cm E) 1 cm
A uniform, horizontal beam of length 6.0 m and weight 140 N is attached at one end to a wall by a pin connection (so that it may rotate). A cable attached to the wall above the pin supports the opposite end. The cable makes an angle of 60° with the horizontal. What is the tension in the cable needed to maintain the beam in equilibrium?
a. 81 N c. 70 N b. 69 N d. 140 N