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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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
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