Questions by Alexspeller

Questions by Alexspeller

A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machine

asked Sep 16, 2018

2 answers

5 votes

109k views

Standing at a trailhead, you look up at a 54 degree angle and see your friend's cell phone reflecting the sun. You know that she is at the top of the 1200-foot cliff and you call her to say you'll meet

asked Jul 4, 2018

2 answers

2 votes

132k views

The fee the bank charges the depositor of a bad check is called

asked Jun 22, 2018

1 answer

0 votes

184k views

Why is a seat belt so important while you in a vehicle?

asked Jan 27, 2018

1 answer

3 votes

27.1k views

The economy of the Hopewell people of North America was based on? a. no sedentary activities, but trading of plants for medicine. b. full-scale domesticated agriculture. c. hunting and gathering, with

asked Jan 3, 2015

1 answer

4 votes

112k views

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