4. Calculate: (1)A net force of 450 N accelerates a bike and rider at 3.5 m/s², what is the mass of the bike and rider? (2)What is the weight of a 75-kg astronaut on earth? (3)Superman must stop a 120Km/h train in 250m to keep it from hitting a stalled car on the tracks. If the train's mass is 4.8×10ʻkg, how much force must he exert? Compare to the weight of the train.

4. Calculate: (1)A net force of 450 N accelerates a bike and rider at 3.5 m/s², what is the mass of the bike and rider? (2)What is the weight of a 75-kg astronaut on earth? (3)Superman must stop a 120Km/h train in 250m to keep it from hitting a stalled car on the tracks. If the train's mass is 4.8×10ʻkg, how much force must he exert? Compare to the weight of the train.

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University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter5: Newton's Law Of Motion

Section: Chapter Questions

Problem 89AP: In building a house, carpenters use nails from a large box. The box is suspended from a spring twice...

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows:

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4. Calculate:
(1)A net force of 450 N accelerates a bike and rider at 3.5 m/s², what is the mass of
the bike and rider?
(2)What is the weight of a 75-kg astronaut on earth?
(3)Superman must stop a 120Km/h train in 250m to keep it from hitting a stalled car
on the tracks. If the train's mass is 4.8×10ʻkg, how much force must he exert?
Compare to the weight of the train.

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