3 years ago

For anyone taking the Velocity and Acceleration Quick Check, Here are the answer.s!

Physics

1 answer:

Kipish [7]3 years ago

5 0

Answer:

this is 100% correct

Explanation:

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The mirror used in search light is:

dolphi86 [110]

Answer:

Explanation:

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3 years ago

In each cycle, a heat engine an input of 1940 J of heat and exhausts 1480 J of heat. What is the thermal efficiency?

AleksAgata [21]

Answer:

0.237 (23.7 %)

Explanation:

The thermal efficiency of an engine is given by:

$\eta=\frac{W}{Q_{in}}$

where

W is the useful work output of the engine

$Q_{in}$ is the heat in input

Here we have:

$Q_{in}=1940 J$

and the work done is the total heat in input minus the heat exhausted:

$W=1940 J - 1480 J=460 J$

So, the efficiency is

$\eta=\frac{460 J}{1940 J}=0.237$ (23.7 %)

8 0

3 years ago

A dynamite blast propels a heavy rock straight up with a launch velocity of 160ft/sec (about 109 mph). Write a position for the

Flura [38]

A) Using:
2as = v² - u², where v will be 0 at max height
s = -(160)² / 2 x -32.174
s = 397.8 ft

b) Using:
s = ut + 1/2 at²
256 = 160t - 16.1t²
solving for t,
t = 2.0, t = 7.9
Now, v = u + at, for both times:
v(2) = 160 - 32.174(2)
v(2) = 95.7 ft/sec on the way up

v(7.9) = 160 - 32.174(7.9)
v(7.9) = -94.3 ft/sec; 94.3 ft/sec on the way down

c) -32.174 ft/s², which is the acceleration due to gravity.

d) s = 0
0 = 160t - 1/2 x 32.174t²
t = 9.94 seconds

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4 years ago

Which character trait below is a trait that both Michael Faraday and Nikola Tesla had?

-Dominant- [34]

They were both odd and obsessive

7 0

4 years ago

Help me pls as soon as possible pls

Alex_Xolod [135]

Answer:

hard working is first on

Explanation:

"my hard working dad"

8 0

3 years ago

Read 2 more answers