PHY1505 Assignment 4
(COMPLETE
ANSWERS) 2024
CONTACT:
, PHY1505 Assignment 4 (COMPLETE ANSWERS) 2024
1. A ball drops some distance and loses 30 J of
gravitational potential energy. Do NOT ignore air
resistance. How much kinetic energy did the ball gain? 2.
The plot in the figure shows the potential energy of a
particle, due to the force exerted on it by another
particle, as a function of distance. At which of the three
points labeled in the figure is the magnitude of the force
on the particle greatest? 3. An 8.0-kg block is released
from rest, with v1 = 0.00 m/s, on a rough incline, as
shown in the figure. The block moves a distance of 1.6-m
down the incline, in a time interval of 0.80 s, and acquires
a velocity of v2 = 4.0 m/s. How much work does gravity
do on the block during this process? 4. You do 174 J of
work while pulling your sister back on a swing, whose
chain is 5.10 m long. You start with the swing hanging
vertically and pull it until the chain makes an angle of
32.0° with the vertical with your sister at rest. What is
your sister's mass, assuming negligible friction? 5. A
tennis ball bounces on the floor three times. If each time
it loses 22.0% of its energy due to heating, how high does
it rise after the third bounce, provided we released it from
the floor? 6. A 60.0-kg person drops from rest a distance
of 1.20 m to a platform of negligible mass supported by
an ideal stiff spring of negligible mass. The platform drops
6.00 cm before the person comes to rest. What is the
spring constant of the spring? 7. A block slides down a
frictionless inclined ramp. If the ramp angle is 17.0° and
its length is find the speed of the block as it reaches the
bottom of the ramp, assuming it started sliding from rest
at the top. 8. A projectile is fired from ground level at an
angle of 40.0° above horizontal at a speed of 30.0 m/s.
(COMPLETE
ANSWERS) 2024
CONTACT:
, PHY1505 Assignment 4 (COMPLETE ANSWERS) 2024
1. A ball drops some distance and loses 30 J of
gravitational potential energy. Do NOT ignore air
resistance. How much kinetic energy did the ball gain? 2.
The plot in the figure shows the potential energy of a
particle, due to the force exerted on it by another
particle, as a function of distance. At which of the three
points labeled in the figure is the magnitude of the force
on the particle greatest? 3. An 8.0-kg block is released
from rest, with v1 = 0.00 m/s, on a rough incline, as
shown in the figure. The block moves a distance of 1.6-m
down the incline, in a time interval of 0.80 s, and acquires
a velocity of v2 = 4.0 m/s. How much work does gravity
do on the block during this process? 4. You do 174 J of
work while pulling your sister back on a swing, whose
chain is 5.10 m long. You start with the swing hanging
vertically and pull it until the chain makes an angle of
32.0° with the vertical with your sister at rest. What is
your sister's mass, assuming negligible friction? 5. A
tennis ball bounces on the floor three times. If each time
it loses 22.0% of its energy due to heating, how high does
it rise after the third bounce, provided we released it from
the floor? 6. A 60.0-kg person drops from rest a distance
of 1.20 m to a platform of negligible mass supported by
an ideal stiff spring of negligible mass. The platform drops
6.00 cm before the person comes to rest. What is the
spring constant of the spring? 7. A block slides down a
frictionless inclined ramp. If the ramp angle is 17.0° and
its length is find the speed of the block as it reaches the
bottom of the ramp, assuming it started sliding from rest
at the top. 8. A projectile is fired from ground level at an
angle of 40.0° above horizontal at a speed of 30.0 m/s.
