Question

a. A toy car is accelerated from rest to 0.620 m / s in 20.0 ms. The mass of the cart is 560 g. Determine the average power applied to the cart.

b. An elevator with 8.00 x 102 kg of mass hangs from a cable. The elevator accelerates downward at a rate of 1.80 m / s2. Determine the cable tension.

Answer #1

A freight elevator in the Burj Khalifa tower in Dubai is lifted
from rest by a cable and accelerated to its maximum climb speed in
a distance of 3.00 m and within a time interval of 1.73 s. Assume
this "lift-off" phase is at constant acceleration.
a) If the average power associated with the tension in the cable
is 82.0 kW during the acceleration phase, what is the magnitude of
the tension in the cable during this phase?
b) What...

A 1200 kg elevator accelerates upward at 1.30 m/s2 for 11.0 m ,
starting from rest.
A.How much work does gravity do on the elevator? Express your
answer with the appropriate units.
B. How much work does the tension in the elevator cable do on
the elevator? Express your answer with the appropriate units.
C.How much work does the tension in the elevator cable do on the
elevator? Express your answer with the appropriate units.
D. What is the speed...

a
car accelerates uniformly from rest to 24.1 m/s in 9 s along a
level stretch of road. Ignoring friction , determine the average
power required to accelerate the car if the mass of the car is
1,131 kg

a 2500 kg car accelerates uniformly from rest to 15.0 m/s in
8.00 s.
What is the work done on the car in this time interval?
What is the power delivered by the engine in this time
interval?
Answer in 3 decimal places, and include full equation please

an elevator of mass m = 400 kg starts from rest and is lowered
to the ground by a rope in three stages. During the first second,
it accelerates at 3 m/s^2 downward, then continues at a constant
speed for six seconds, then slows down to a rest at 1 m/s^2 for
three seconds.
a) find the initial height of the elevator.
b) find the total work done by the elevator by the rope.
c) find the average power done...

A car accelerates uniformly from rest to 17.9 m/s in 6.31 s
along a level stretch of road. Ignoring friction, determine the
average power required to accelerate the car if (a) the weight of
the car is 8.28 x 103 N, and (b) the weight of the car is 1.58 x
104 N.

A jogger accelerates from rest to 3.04 m/s in 2.45 s. A car
accelerates from 16.4 to 28.4 m/s also in 2.45 s.
(a) Find the magnitude of the acceleration of the
jogger. (b) Determine the magnitude of the
acceleration of the car. (c) How much further does
the car travel than the jogger during the 2.45 s?

A jogger accelerates from rest to 2.23 m/s in 3.48 s. A car
accelerates from 18.4 to 30.7 m/s also in 3.48 s.
(a) Find the magnitude of the acceleration of the
jogger. (b) Determine the magnitude of the
acceleration of the car. (c) How much further does
the car travel than the jogger during the 3.48 s?

3. A helicopter travelling at a velocity of 15 m/s [W]
accelerates uniformly at a rate of 7.0 m/s2 [E] for 4.0 s. What is
the helicopter’s final velocity?
4. Two go-carts, A and B, race each other around a 1.0
km track. Go-cart A travels at a constant speed of 20.0 m/s.
Go-cart B accelerates uniformly from rest at a rate of 0.333 m/s2 .
Which go-cart wins the race and by how much time?
5. A boat increases...

The electric motor of a model train accelerates the train from
rest to 0.640 m/s in 17.0 ms. The total mass of the train is 875 g.
Find the average power delivered to the train during its
acceleration.

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