CP BIO A Standing Vertical Jump. Basketball player Darrell Griffith is on record as attaining a standing vertical jump of 1.2 m (4 ft). (This means that he moved upward by 1.2 m after his feet left the floor.) Griffith weighed 890 N (200 lb). (a) What was his speed as he left the floor? (b) If the time of the part of the jump before his feet left the floor was 0.300 s. what was his average acceleration (magnitude and direction) while he pushed against the floor? (c) Draw his free-body diagram. In terms of the forces on the diagram, what was the net force on him? Use Newton’s laws and the results of part (b) to calculate the average force he applied to the ground.
CP BIO A Standing Vertical Jump. Basketball player Darrell Griffith is on record as attaining a standing vertical jump of 1.2 m (4 ft). (This means that he moved upward by 1.2 m after his feet left the floor.) Griffith weighed 890 N (200 lb). (a) What was his speed as he left the floor? (b) If the time of the part of the jump before his feet left the floor was 0.300 s. what was his average acceleration (magnitude and direction) while he pushed against the floor? (c) Draw his free-body diagram. In terms of the forces on the diagram, what was the net force on him? Use Newton’s laws and the results of part (b) to calculate the average force he applied to the ground.
CP BIO A Standing Vertical Jump. Basketball player Darrell Griffith is on record as attaining a standing vertical jump of 1.2 m (4 ft). (This means that he moved upward by 1.2 m after his feet left the floor.) Griffith weighed 890 N (200 lb). (a) What was his speed as he left the floor? (b) If the time of the part of the jump before his feet left the floor was 0.300 s. what was his average acceleration (magnitude and direction) while he pushed against the floor? (c) Draw his free-body diagram. In terms of the forces on the diagram, what was the net force on him? Use Newton’s laws and the results of part (b) to calculate the average force he applied to the ground.
A net force of 81.6 N propels a 4.00-kg model rocket. After being launched from rest, how fast is the rocket traveling after 2.00 s? Enter the numerical value in Sl units.
The mass of an ear ring is 950 mg. Express this mass in Sl unit.
1.
(a) 9.50 x 106 kg
(b) 9.50 x 104 kg
(c) 9.50 x 103 g
(d) 9.50 x 101 g
A 16 g steel ball and a 10 g nylon ball are dropped from the same height at the same time. As the ball
2.
reaches the ground, which of the following quantity is not the same for both the balls?
|(a) Displacement
(b) Velocity
(c) Acceleration
(d) Weight.
A boy pulls a table to the left with a force of 25 N. A second boy pulls the same table to the right with
3.
a force of 15 N. What is the resultant force acting on the table?
(a) 10 N right
(b) 10 N left
(c) 40 N right
(d) 40 N left
A driver accelerates his car and raises its speed from 40 km/h to 80 km/h. The kinetic energy of the
4.
car becomes; (a) 2 times
(b) 4 times
(c) half
(d) same
The diameter of an optical fiber is 6.0 nm. Its radius in m is
5.
(a) 12.0 x 106 m
(b) 12.0 x 10° m
(c) 3.0 x 106 m
(d) 3.0 x 10° m.
A swimmer completes the first 50 m of the 100-m free style in 37.8 s. On reaching…
Three crates with various contents are pulled by a force Fpull = 3595 N across a horizontal, frictionless roller-conveyor
system. The group of boxes accelerates at 1.546 m/s² to the right. Between each adjacent pair of boxes is a force meter that
measures the magnitude of the tension in the connecting rope. Between the box of mass mj and the box of mass m2, the force
meter reads F12 = 1384 N. Between the box of mass mɔ and the box of mass m3, the force meter reads F23 = 2288 N.
Assume that the ropes and force meters are massless.
m,
m2
m3
F
pull
FRAGILE
FRAGILE
FRAGILE
F
12
F,
23
What is the total mass of the three boxes?
Chapter 4 Solutions
University Physics with Modern Physics Plus Mastering Physics with eText -- Access Card Package (14th Edition)
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