PHY1505
Assignment 4
(COMPLETE
ANSWERS)
2024
[Type the document subtitle]
[Pick the date]
[Type the company name]
, Exam (elaborations)
PHY1505 Assignment 4 (COMPLETE ANSWERS) 2024
Course
Mechanics (PHY1505)
Institution
University Of South Africa (Unisa)
Book
Mechanics
PHY1505 Assignment 4 (COMPLETE ANSWERS) 2024 - DUE September
2024 ; 100% TRUSTED Complete, trusted solutions and explanations. For
assistance, Whats-App 0.6.7-1.7.1-1.7.3.9. Ensure your success with us.
. 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. What is the speed of the projectile when it
has reached a height equal to 50.0% of its maximum height? 9. An object is
attached to a hanging unstretched ideal and massless spring and slowly
Assignment 4
(COMPLETE
ANSWERS)
2024
[Type the document subtitle]
[Pick the date]
[Type the company name]
, Exam (elaborations)
PHY1505 Assignment 4 (COMPLETE ANSWERS) 2024
Course
Mechanics (PHY1505)
Institution
University Of South Africa (Unisa)
Book
Mechanics
PHY1505 Assignment 4 (COMPLETE ANSWERS) 2024 - DUE September
2024 ; 100% TRUSTED Complete, trusted solutions and explanations. For
assistance, Whats-App 0.6.7-1.7.1-1.7.3.9. Ensure your success with us.
. 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. What is the speed of the projectile when it
has reached a height equal to 50.0% of its maximum height? 9. An object is
attached to a hanging unstretched ideal and massless spring and slowly
