Homework Answers
1.
m1gh - m2gh = 1/2 (m1+m2) v^2
v^2 = 2(m1-m2)gh/(m1+m2) = 2*5*9.8*2/15
v = 3.6148 m/s
2.
Power = Energy/time
95 km/h = 26.38 m/s
acceleration = 26.38/7.4 = 3.566 m/s2
distance = 1/2 a t^2 = 97.64 m
average speed = 97.64/7.4 = 13.2 m/s
P = 1400*3.566*13.2 = 65872 Watts
Add Answer to:
Name 1) Date More Energy and Power Problems The system starts at rest. What is the...
_10. You and your BFF (combined mass of 200 kg) are taking an elevator to your...
_10. You and your BFF (combined mass of 200 kg) are taking an elevator to your physics lecture. The elevator car has a mass of 1,600 kg. A constant friction force of 4,000 N retards the elevator's motion. How much power must the motor deliver to lift the elevator car and its passengers at a constant speed of 3.00 m/s? a. 6.49 x 104 W = 200kn P U b. 1.24 x 10 W c. 5.33 x 10 W d....
20.64 Electric Power and Energy Assuming 91.0% efficiency for the conversion of electrical power by the...
20.64 Electric Power and Energy Assuming 91.0% efficiency for the conversion of electrical power by the motor, what current must the 84.0-V batteries of a 690-kg electric car be able to supply: To accelerate from rest to 22.0 m/s in 1.00 min? Figure caption: This REVAi, an electric car, gets recharged on a street in London. (credit: Frank Hebbert) Submit Answer Tries 0/10 To climb a 190-m-high hill in 2.00 min at a constant 22.0-m/s speed while exerting 410 N...
using figure 1 and information below find the forces and power needed to move the elevator(lift)....
using figure 1 and information below find the forces and power
needed to move the elevator(lift).
needed answers are:
1 finding the service loads
2 mechanical analysis to the shaft
3 power the motor required to move the system.
Project Introduction The system to be designed is a lifting system (elevator) for people located in a building using an electric drive system. There is one car that needs to be lifted as high as 15 metres. The arrangement of the...
A 500 kg elevator starts from rest. It moves upward for 2.50 s with constant acceleration...
A 500 kg elevator starts from rest. It moves upward for 2.50 s with constant acceleration until it reaches its cruising speed, 1.75 m/s. a.) What is the average power of the elevator motor during this period? b.) How does this power compare with the motor power when the elevator moves at its cruising speed?
Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the...
Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0-V batteries of a 728-kg electric car be able to supply to do the following? (a) accelerate from rest to 25.0 m/s in 1.00 min A (b) climb a 200-m high hill in 2.00 min at a constant 25.0 m/s speed while exerting 443 N of force to overcome air resistance and friction A
A 639-kg elevator starts from rest and moves upward for 3.40 s with constant acceleration until...
A 639-kg elevator starts from rest and moves upward for 3.40 s with constant acceleration until it reaches its cruising speed, 1.78 m/s. (a) What is the average power of the elevator motor during this period? (b) How does this amount of power compare with its power during an upright trip with constant speed?
A 612-kg elevator starts from rest and moves upward for 4.50 s with constant acceleration until...
A 612-kg elevator starts from rest and moves upward for 4.50 s with constant acceleration until it reaches its cruising speed, 1.64 m/s. (a) What is the average power of the elevator motor during this period? hp (b) How does this amount of power compare with its power during an upward trip with constant speed? (Give the power during an upward trip with constant speed.) hp
One kind of elevator has the elevator car hanging from a cable, which then passes over...
One kind of elevator has the elevator car hanging from a cable,
which then passes over a pulley and connects to a counterweight, as
shown in (Figure 1). The mass of a fully-loaded elevator (that is,
the elevator and all its passengers) is 1850 kg , the mass of the
counterweight is 1500 kg , and the pulley has a radius of 0.4 m
and a mass of 400 kg . A motor drives the motion of the elevator by...
A 1000 kg race car starts from rest and reaches a speed of 100 km/h in...
A 1000 kg race car starts from rest and reaches a speed of 100 km/h in 20 s. What is the power delivered by the car’s engine? (2 points). A 1 kg mass is released from the top of a smooth slide of height 2m. At the bottom of the slide the mass slides on a horizontal surface and stops at a distance of 5 m. What is the coefficient of kinetic friction of the horizontal surface? (3.5 points). The...
Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the...
Assuming 95.0% efficiency for the conversion of electrical power by the motor, what current must the 12.0-V batteries of a 692-kg electric car be able to supply to climb a 359-m high hill in 2.00 min at a constant 11.3 m/s speed while exerting 569 N of force to overcome air resistance and friction
_10. You and your BFF (combined mass of 200 kg) are taking an elevator to your physics lecture. The elevator car has a mass of 1,600 kg. A constant friction force of 4,000 N retards the elevator's motion. How much power must the motor deliver to lift the elevator car and its passengers at a constant speed of 3.00 m/s? a. 6.49 x 104 W = 200kn P U b. 1.24 x 10 W c. 5.33 x 10 W d....
20.64 Electric Power and Energy Assuming 91.0% efficiency for the conversion of electrical power by the motor, what current must the 84.0-V batteries of a 690-kg electric car be able to supply: To accelerate from rest to 22.0 m/s in 1.00 min? Figure caption: This REVAi, an electric car, gets recharged on a street in London. (credit: Frank Hebbert) Submit Answer Tries 0/10 To climb a 190-m-high hill in 2.00 min at a constant 22.0-m/s speed while exerting 410 N...
using figure 1 and information below find the forces and power
needed to move the elevator(lift).
needed answers are:
1 finding the service loads
2 mechanical analysis to the shaft
3 power the motor required to move the system.
Project Introduction The system to be designed is a lifting system (elevator) for people located in a building using an electric drive system. There is one car that needs to be lifted as high as 15 metres. The arrangement of the...
One kind of elevator has the elevator car hanging from a cable,
which then passes over a pulley and connects to a counterweight, as
shown in (Figure 1). The mass of a fully-loaded elevator (that is,
the elevator and all its passengers) is 1850 kg , the mass of the
counterweight is 1500 kg , and the pulley has a radius of 0.4 m
and a mass of 400 kg . A motor drives the motion of the elevator by...
Most questions answered within 3 hours.
-
In the Chesapeake region during the mid-17th
century how similar was the experience of an independent...
asked 1 hour ago -
. A 2.50 M stock solution was used to prepare a dilute NaOH
solution with a...
asked 2 hours ago -
Write a program that reads in a text file, infile.txt, and
prints out all the lines...
asked 4 hours ago -
Which of the following orbits have a total of zero energy (based
on the common convention)?...
asked 4 hours ago -
Find the expected count and the contribution to the chi-square
statistic for the (Group 1, No)...
asked 5 hours ago -
Suppose you are purchasing a meal and with every meal a you
receive one of 10...
asked 5 hours ago -
A 75.0 kg 0erson is riding in a car moving at 20.0 m/s when the
car...
asked 5 hours ago -
What does Δp = QR mean in words?
Pushing a viscous fluid through a pipe requires...
asked 5 hours ago -
We know that system.out.println (“object number” + n ); is
legal.String name; int n; name =...
asked 5 hours ago -
Come up with a real-life problem (open-ended) and solve it by
designing and writing a Java...
asked 6 hours ago -
Power Music owns five music stores, where it sells music,
instruments, and supplies. In addition, it...
asked 6 hours ago -
True or false and
why:
Given the following sequence of numbers to be
inserted {4,5,6,1,2,3,8,7}, the...
asked 6 hours ago