Question

Consider a 13 kg block which rests on the smooth surface and is subjected to a horizontal force of F=8 N. The block has an initial speed of 5 m/s and travels 24m, both directed to the right and measured from the fixed frame A. Observer B is attached to the x′ axis and is moving at a constant velocity of 55 m/s to the right relative to a stationary observer at A. Determine the work done by the force F as observed by B (in Joules).

Answer #1

Acceleration (a) = F/m = 8/13

from newton's equation of motion -

d = ut + at^{2}/2

24 = 5t + (8/13)t^{2}/2

t = 3.876 sec

Work done (W) =

F = force

d = displacement

= angle between force and displacement

In rest frame -

displacement = 24 m

Displacement of moving frame = 55x3.876

= 213.1635 m

Diaplacement with respect to moving frame =

24 - 213.16= - 189.16 m

So work (W) = - 8x189.16

**Work done (W) = - 1513.31 Joule**

A block rests on a horizontal, frictionless surface. A string is
attached to the block, and is pulled with a force of 48.0 N at an
angle θ above the horizontal. After the block is pulled through a
distance of 16.0 m its speed is v = 2.10 m/s, and 40.0 J
of work has been done on it.What is the mass of the block? (Answer
in kg)

A block of mass 4.0 kg rests on a horizontal surface where the
coefficient of kinetic friction between the two is 0.20. A string
attached to the block is pulled horizontally, resulting in a
3.0-m/s 2 acceleration by the block. Find the tension in
the string. ( g = 9.80 m/s 2)

A block of mass 4.0 kg rests on a horizontal surface where the
coefficient of kinetic friction between the two is 0.20. A string
attached to the block is pulled horizontally, resulting in a
3.0-m/s2 acceleration by the block. Find the tension in the string.
(g = 9.80 m/s2)

A block rests on a frictionless horizontal surface and is
attached to a spring. When set into simple harmonic motion, the
block oscillates back and forth with an angular frequency of 8.9
rad/s. The drawing shows the position of the block when the spring
is unstrained. This position is labeled ''x = 0 m.'' The drawing
also shows a small bottle located 0.080 m to the right of this
position. The block is pulled to the right, stretching the spring...

A block of mass m = 0.53 kg attached to a spring with force
constant 119 N/m is free to move on a frictionless, horizontal
surface as in the figure below. The block is released from rest
after the spring is stretched a distance A = 0.13 m. (Indicate the
direction with the sign of your answer. Assume that the positive
direction is to the right.)
The left end of a horizontal spring is attached to a vertical
wall, and...

A textbook of mass 2.09 kg rests on a frictionless, horizontal
surface. A cord attached to the book passes over a pulley whose
diameter is 0.130 m , to a hanging book with mass 3.02 kg . The
system is released from rest, and the books are observed to move a
distance 1.12 m over a time interval of 0.790 s .
What is the tension in the part of the cord attached to the
textbook?
What is the tension...

A 6.20 kg block is pushed 9.50 m up a smooth 36.0 ∘inclined
plane by a horizontal force of 70.0 N . If the initial speed of the
block is 3.50 m/s up the plane.
Calculate the initial kinetic energy of the block.
Calculate the work done by the 70.0 N force.
Calculate the work done by gravity.
Calculate the work done by the normal force.
Calculate the final kinetic energy of the block.
Please explain

A 0.400kg0.400kg block is initially at rest on a
horizontal surface, and is attached to an initially unstreteched
spring with a force constant of 2.00N/m2.00N/m. The coefficient of
kinetic friction between the block and the surface is 0.4000.400. A
constant force of 2.30N2.30N to the right is applied to the
block.
(A) Draw a free body diagram showing all forces on the block as
it moves to the right.
Determine
(B) the initial Kinetic Energy of the block: J,
and
(C)...

A 0.400kg0.400kg block is initially at rest on a
horizontal surface, and is attached to an initially unstreteched
spring with a force constant of 2.00N/m2.00N/m. The coefficient of
kinetic friction between the block and the surface is 0.4000.400. A
constant force of 2.30N2.30N to the right is applied to the
block.
(A) Draw a free body diagram showing all forces on the block as
it moves to the right.
Determine
(B) the initial Kinetic Energy of the block: J,
and
(C)...

The block of M=5kg, modeled as a particle, rests on the inclined
surface that makes an angle of θ with the horizontal ground. The
static friction coefficient between the block and the surface is
μs=1/3. A force of P is horizontally applied on the block. Take
g=10m/s/s for convenience.
1. Draw a free body diagram.
2. Write each force expressed in cartesian vector form.
3. Write down scalar compontent form of equilibrium equations in
x and y direction.
4. Find...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 10 minutes ago

asked 25 minutes ago

asked 47 minutes ago

asked 1 hour ago

asked 1 hour 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