Question

A luge and its rider, with a total mass of 76.0 kg, emerge from
a downhill track onto a horizontal straight track with an initial
speed of 35.0 m/s. If a force slows them to a stop at a constant
rate of 4.00 m/s^{2}, **(a)** what magnitude
*F* is required for the force, **(b)** what
distance *d* do they travel while slowing, and
**(c)** what work *W* is done on them by the
force? What are **(d)** *F*,
**(e)** *d*, and **(f)**
*W* if they, instead, slow at 8.00 m/s^{2}?

Answer #1

A luge and its rider, with a total mass of 50 kg, emerge from a
downhill track onto a horizontal straight track with an initial
speed of 39 m/s. If a force slows them to a stop at a constant rate
of 1.2 m/s2, (a) what magnitude
F is required for the force, (b) what
distance d do they travel while slowing, and
(c) what work W is done on them by the
force? What are (d) F,
(e) d,...

A car of 1000 kg with good tires on a dry road can decelerate
(slow down) at a steady rate of about 5.0 m/s2 when braking. If a
car is initially traveling at 20 m/s (45 mi/h),
(a) How much time does it take the car to stop?
(b) What is its stopping distance?
(c) What is the deacceleration?
(d) How big is the net force to be applied to stop this car?
(e) Calculate the work done by this...

1`A puck of mass 0.110 kg slides across ice in the positive
x-direction with a kinetic friction coefficient between
the ice and puck of 0.167. If the puck is moving at an initial
speed of 15.0 m/s, find the following.
(a) What is the force of kinetic friction? (Indicate the
direction with the sign of your answer.)
N
(b) What is the acceleration of the puck? (Indicate the direction
with the sign of your answer.)
m/s2
(c) How long does...

A baby bird falls from its nest in a tree. Luckily, Sasquatch
catches the baby bird before it hits the ground, bringing it to
rest. Which describes the work W done by Sasquatch on the baby bird
and its change in gravitational potential energy ∆Ugrav between the
nest and where it was caught?
A. W > 0, ∆Ugrav < 0
B. W > 0, ∆Ugrav > 0
C. W = 0, ∆Ugrav > 0
D. W < 0, ∆Ugrav <...

An object with a mass m = 3.5 kg is released from rest at the
top of the ramp. The length of the ramp is 4 m. The object slides
down the ramp reaching a speed of 1.8 m/s at the bottom.
(a) How much time (in sec) does it take the object to reach the
bottom of the ramp? (use kinematics equations)
(b) What is the acceleration of the object (in m/s2 )? (use
kinematics equations)
(c) If the...

A spring of negligible mass stretches 3.00 cm from its relaxed
length when a force of 7.10 N is applied. A 0.440-kg particle rests
on a frictionless horizontal surface and is attached to the free
end of the spring. The particle is displaced from the origin to
x = 5.00 cm and released from rest at t = 0.
(Assume that the direction of the initial displacement is positive.
Use the exact values you enter to make later calculations.)
(a)...

A 2400-kg test rocket is launched vertically from the launch
pad. Its fuel (of negligible mass) provides a thrust force so that
its vertical velocity as a function of time is given by
v(t)=At+Bt2, where A and B are constants and time is measured from
the instant the fuel is ignited. At the instant of ignition, the
rocket has an upward acceleration of 1.90 m/s2 and 1.20 s later an
upward velocity of 1.50 m/s .
Part A) Determine A....

a) An oil droplet with a mass of 7.20 x 10-16 kg is
moving upward at a constant speed of 2.0 m/s between two horizontal
charged plates. If the electric field strength between the plates
is 2.20 x 104 V/m what is the charge on the oil droplet
? answer in the format of a.bc x 10-de C
b) An oil droplet with a mass of 3.50 x 10-15 kg
accelerates downward at a rate of 2.50 m/s2 when it...

Two boxes are stacked, with box B placed on top of box A. If box
A is pushed such that both boxes move with a decreasing speed, is
there any friction on either box?
(a) Kinetic friction on box A and no friction on box B (b)
Kinetic friction on box A and static friction on box B
(c) Kinetic friction on box A and kinetic friction on box B (d)
Static friction on box A and kinetic friction on...

ch 6
1:
It is generally a good idea to gain an understanding of the
"size" of units. Consider the objects and calculate the kinetic
energy of each one.
A ladybug weighing 37.3 mg
flies by your head at 3.83 km/h
.
×10
J
A 7.15 kg
bowling ball slides (not rolls) down an alley at 17.5 km/h
.
J
A car weighing 1260 kg
moves at a speed of 49.5 km/h.
5:
The graph shows the ?-directed force
??...

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