Question

3) A 3 kg block is sliding at an initial speed of 9 m/s across a surface, encountering a constant friction force of 10 N. How much work is done on the block after it slides 25 cm? Correct, computer gets: -2.50 J Hint: Does the block gain or lose energy during this process? What sign does this imply for the work done on it? 4) How fast is the block moving after sliding 25 cm? Correct, computer gets: 8.91 m/s Hint: You can treat the block like a simple particle. What kind of energy does it have and how is this affected by the work done on it? 5) What's the total distance the block travels before coming to rest? Correct, computer gets: 12.15 m 6) What is the average power of friction on the block over the time it takes the block to come to rest? Answer: Last Answer: 4 Not yet correct, tries 3/25 7) What was the instantaneous power of friction on the block after it slid the first 25 cm? Answer: Last Answer: 80 J/s Incorrect, tries 6/25. ONLY NEED 6 AND 7, Thank you!

Answer #1

A 4 kg block is sliding at an initial speed of 10 m/s across a
surface, encountering a constant friction force of 9 N. How much
work is done on the block after it slides 20 cm?
How fast is the block moving after sliding 20 cm?
What's the total distance the block travels before coming to
rest?
What is the average power of friction on the block over the time
it takes the block to come to rest?
What...

25) 6.50 kg block of ice sliding on the floor at 10.0 m/s
encounters a rough section for 4.0 m that has a coefficient of
kinetic friction of 0.820.
A) draw and label the figure
B) find the speed of the block after it passes the rough
section
C) the block encounters a spring and comes to rest after
compressing the spring for 20 cm. FIND the spring constant of the
spring

A 2.0 kg block at rest is accelerated uniformly across a floor
to a speed of 10 m/s in 3.0 s. The coefficient of kinetic friction
between the block on the floor is 0.15.
a. How much work is done on the block by the accelerating force
in the 3.0s interval?
b. What is the instantaneous power due to that force at the end
of the interval?
c. What is the average power done by the force throughout the
interval?

A 2.5-kg block is sliding along a rough horizontal surface and
collides with a horizontal spring whose spring constant is 320 N/m.
Unstretched, the spring is 20.0 cm long. The block causes the
spring to compress to a length of 12.5 cm as the block temporarily
comes to rest. The coefficient of kinetic friction between the
block and the horizontal surface is 0.25. a) How much work is done
by the spring as it brings the block to rest? b)...

A box of unknown mass is sliding with an initial speed
vi = 5.70 m/s
across a horizontal frictionless warehouse floor when it
encounters a rough section of flooring
d = 3.50 m
long. The coefficient of kinetic friction between the rough
section of flooring and the box is 0.100. Using energy
considerations, determine the final speed of the box (in m/s) after
sliding across the rough section of flooring.

A 6.0 kg block is sliding on a leve, frictionless surface at a
speed of 5.0 m/s when it undergoes a head-on, perfectly inelastic
collision with a 4.0 kg block that is initially at rest on the top
of a frictionless, 2.0 m high inclined plane. A) What is the speed
of the combined blocks when they reach the bottom of the incline?
B) If the ground at the bottom of the incline is level, and if the
coefficient of...

A 5.0 kg block with a speed of 3.0 m/s collides with a 10 kg
block that has a speed of 2.2 m/s in the same direction. After the
collision, the 10 kg block is observed to be traveling in the
original direction with a speed of 2.7 m/s.
(b) By how much does the total kinetic energy of the system of two
blocks change because of the collision?
________ J
(c) Suppose, instead, that the 10 kg block ends...

A 10 g bullet is fired with 450 m/s into a 10 kg block that sits
at rest on a wooden table 20 cm from the edge of the table. The
bullet gets embedded in the block (perfectly inelastic collision).
The block, with the embedded bullet, then slides to the edge of the
table and drops down with some initial velocity while leaving the
edge of the table. The coefficient of kinetic friction between the
block and the surface of...

1. A bottle of mass 0.5 kg is given an initial velocity of 2.3
m/s on a rough, horizontal surface. Draw a diagram showing all of
the forces on the bottle as it moves across the surface. The bottle
comes to rest after travelling a distance of 1.3 m. Calculate the
time taken to come to rest, the deceleration and the friction
force.
2. Block A has a mass of 4 kg and block B has a mass of 6...

A block with mass m = 14 kg rests on a frictionless table and is
accelerated by a spring with spring constant k = 4399 N/m after
being compressed a distance x1 = 0.468 m from the
spring’s unstretched length. The floor is frictionless except for a
rough patch a distance d = 2 m long. For this rough path, the
coefficient of friction is μk = 0.48.
1)How much work is done by the spring as it accelerates the...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 10 minutes ago

asked 16 minutes ago

asked 24 minutes ago

asked 39 minutes ago

asked 49 minutes ago

asked 53 minutes ago

asked 54 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago