Question

A small motor has a power rating of 2.24 kW. It is used to lift a...

A small motor has a power rating of 2.24 kW. It is used to lift a crate. (a) The motor is able to lift the crate 1.5 m in 4 s. What is the mass of the crate? (b) This motor is then used to push a 200 kg box along the floor. If the box is travelling at 2 m/s, what would be the maximum acceleration from the motor at this velocity? (c) What would be the kinetic energy of the box at the velocity of 2 m/s? -2 A glass window is 1.5 mm thick and has a heat flux passing through it of 15 kW.m . The thermal conductivity of the glass is 0.7 W/m.K. (d) If the outside temperature is 12 °C, calculate the inside temperature. (e) If the window is rectangular with dimensions of 2 m x 3 m, how much heat is lost through the window in 5 hours?

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A 2.2 m x 0.94 m x 4.7 cm thick solid wood door has a 0.4...
A 2.2 m x 0.94 m x 4.7 cm thick solid wood door has a 0.4 m square window. The window has two panes of 0.42 cm thick glass with a 0.2 cm thick space between the glass panes that is filled with argon. Argon is used since it has a thermal conductivity that is 34% lower than that of air. The inside air temperature is 21 °C and the outside temperature is -8 °C. Determine the magnitude of the...
A 2.1 m x 0.95 m x 5.2 cm thick solid wood door has a 0.5...
A 2.1 m x 0.95 m x 5.2 cm thick solid wood door has a 0.5 m square window. The window has two panes of 0.47 cm thick glass with a 0.2 cm thick space between the glass panes that is filled with argon. Argon is used since it has a thermal conductivity that is 34% lower than that of air. The inside air temperature is 18 °C and the outside temperature is -11 °C. Determine the magnitude of the...
1. Consider a 1.8-m high and 1.5 m-wide double-pane window consisting of two 4-mm thick layers...
1. Consider a 1.8-m high and 1.5 m-wide double-pane window consisting of two 4-mm thick layers of glass (k = 0.78 W/m°C) separated by a 10-mm wide stagnant air space (k = 0.026 W/m°C). The room is maintained at 20°C while the temperature of the outdoors is -10°C. Take the convective heat transfer coefficients on the inner and outer surfaces of the window to be 10 W/m2°C and 40 W/m2°C, respectively. Determine the steady rate of heat transfer through this...
Your firm has designed a new 2m​ double-paned window which consists of two 5 mm thick...
Your firm has designed a new 2m​ double-paned window which consists of two 5 mm thick plates of glass (​k​ = 0.75 W/mK) separated by a 14 mm thick layer of xenon gas with an unknown thermal conductivity, which you intend to determine through an experiment. You use a heater that provides 100 W of heat to maintain one side of the window at 80 °C while the other 2​ side is exposed to the air in the room with...
1)A glass windowpane in a home is 0.62 cm thick and has dimensions of 1.1 m...
1)A glass windowpane in a home is 0.62 cm thick and has dimensions of 1.1 m × 1.8 m. On a certain day, the indoor temperature is 23°C and the outdoor temperature is 0°C. (a) What is the rate at which energy is transferred by heat through the glass? _________W (b) How much energy is lost through the window in one day, assuming the temperatures inside and outside remain constant? _________J 2) A(n) 6.0-kg copper block is given an initial...
Combustion gases passing through a 2.3-cm-internal diameter circular tube are used to vaporize waste water at...
Combustion gases passing through a 2.3-cm-internal diameter circular tube are used to vaporize waste water at atmospheric pressure. Hot gases enter the tube at 115 kPa and 250°C at a mean velocity of 5 m/s, and leave at 150°C. If the average heat transfer coefficient is 120 W/m2 °C and the inner surface temperature of the tube is 112°C, determine the tube length. Answer in cm with two(2) decimal places.
The condenser of a large steam power plant is a heat exchanger in which steam is...
The condenser of a large steam power plant is a heat exchanger in which steam is condensed to liquid water. Assume the condenser to be a parallel flow shell-and-tube heat exchanger consisting of a single shell and 10,000 tubes, each executing two passes. The tubes are of thin wall construction with D = 30 mm and the steam condenses on their outer surface. The heat transfer rate that must be effected by the exchanger is Q = 2 × 10^9...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT