Question

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?

Answer #1

Please upvote if you have understood the solution.

An initially stationary 3.8 kg object accelerates
horizontally and uniformly to a speed of 14 m/s in 3.6
s. In that 3.6 s interval, how much work is done
on the object by the force accelerating it?
What is the instantaneous power due to that force at the end of
the interval?
What is the instantaneous power due to that force at the end of
the first half of the interval?

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...

A worker pushed a 36.0 kg block 6.60 m along a level floor at
constant speed with a force directed 23.0° below the horizontal. If
the coefficient of kinetic friction between block and floor was
0.400, what were (a) the work done by the worker's
force and (b) the increase in thermal energy of
the block-floor system?

In the figure, a 4.3 kg block is accelerated from rest by a
compressed spring of spring constant 620 N/m. The block leaves the
spring at the spring's relaxed length and then travels over a
horizontal floor with a coefficient of kinetic friction
μk = 0.284. The frictional force stops the
block in distance D = 7.4 m. What are (a)
the increase in the thermal energy of the block–floor system,
(b) the maximum kinetic energy of the block, and...

In the figure, a 3.5 kg block is accelerated from rest by a
compressed spring of spring constant 620 N/m. The block leaves the
spring at the spring's relaxed length and then travels over a
horizontal floor with a coefficient of kinetic friction μk = 0.256.
The frictional force stops the block in distance D = 7.8 m. What
are (a) the increase in the thermal energy of the block–floor
system, (b) the maximum kinetic energy of the block, and...

P7E1 A 60 kg cabinet, initially at rest, is being pushed across
the floor with a horizontal force (F) = 20.0 N as shown in the
diagram. A kinetic friction force (fk) opposes the motion. After
the cabinet has moved a distance of 4.00 m horizontally, the speed
of the cabinet is 1.20 m/s. Cabinet
a) Use the Work - Kinetic Energy Theorem to determine the net
work done on the cabinet. Wnet = 43.2 J Correct: Your answer is...

20.0-kg block initially sits at rest on a rough horizontal
floor. One end of a string is attached to the block. You pull on
the other end of the string with a force of 40.0 N so that the
string makes an angle of 30.0° with the horizontal. After pulling
the block 3.00 m across the floor, it is traveling with a speed of
1.25 m/s. What is the magnitude of the force of kinetic friction
exerted on the block...

A block of mass m = 3.57 kg is drawn at a constant speed
of 4.06 m along a horizontal floor by a rope exerting a constant
force of 7.68 N at an angle of 15.0˚ above the horizontal.
Determine the work done on the block by the rope, the work done by
friction and the coefficient of kinetic friction between the floor
and block.

A 36.5 kg box initially at rest is pushed 4.25 m along a rough,
horizontal floor with a constant applied horizontal force of 150 N.
If the coefficient of friction between box and floor is 0.300, find
the following.
(a) the work done by the applied force
J
(b) the increase in internal energy in the box-floor system due to
friction
J
(c) the work done by the normal force
J
(d) the work done by the gravitational force
J...

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...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 16 minutes ago

asked 25 minutes ago

asked 52 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 3 hours ago