4. While standing on a scale, a 70 kg man reads 686 N on the display What is the

Question

4. While standing on a scale, a 70 kg man reads 686 N on the display What is the magnitude and direction of the normal force acting on the man? Note: Up is towards the ceiling, down is towards the floor a) 70 N, down b) 686N, up c) 70N, up d) 686 N, down e) None of the above 5. Near the Earth's surface, what is the weight of a 5.75 kg box of screws? a) 98.10 N b) 56.35 N c) 5.75 N d) 5.25 N e) 65.50N 6. Ned Stark has a mass of 90 kg and Robert Baratheon has a mass of 120 kg. If the two are standing 3 m apart, what is the magnitude of the gravitational force between them? a) 4 × 10-7N b) 120× 10-7N c) 25 x 10 ' N d) 16 × 10-8N

Explanation / Answer

4) 70N up. 5)m=5.75kg ..w= mg =5.75×9.8=56.35N. 6) F= Gmm/r2. = 6.67×10_11×90×120/9=8004×10_11 =8×10_8 n

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