3 years ago

A painter lifts a 3 kg can of paint 3 m above the floor. How much work was done?

Physics

1 answer:

Sindrei [870]3 years ago

3 0

Hey there!

P= 3kg=3

W=m x g x d =3kg x 9 8 m/s² x 3m = 88J

Hope this helped you and solve your problem

TobeySnaps.

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A bicyclist bikes the 90 mi to a city averaging a certain speed. The return trip is made at a speed that is 1 mph slower. Total

Lynna [10]

Answer:

his speeds while going to city is 10 mph and while his round trip the speed will be 9 mph

Explanation:

Let say the speed of the bicycle while he moves towards the city is "v"

now the speed of the round trip must be smaller by 1 mph

so its speed for round trip will be

$v_2 = v - 1$

now we know that total time of the motion is 19 hr

so we will have

$t_1 = \frac{90}{v}$

$t_2 = \frac{90}{v - 1}$

so we will have

$t_1 + t_2 = 19 hr$

$\frac{90}{v} + \frac{90}{v-1} = 19$

$90(2v - 1) = 19(v^2 - v)$

$19 v^2 - 199 v + 90 = 0$

by solving above equation we have

$v = 10 mph$

so his speeds while going to city is 10 mph and while his round trip the speed will be 9 mph

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3 years ago

3. A 142 g baseball is thrown at a speed of 42.9 m/s. What is the kinetic energy of the baseball at this moment?

krok68 [10]

Kinetic energy=1/2mv^2
=1/2(142*10^-3)(42.9)^2=130.6=131J

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3 years ago

A horse has an acceleration of 2 m/s2. If it starts from rest, how fast is it going after 1.7 seconds?

fgiga [73]

(2 m/s²) · (1.7 s) = 3.4 m/s

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Find the order of magnitude of your age in seconds

Natali5045456 [20]

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Answer:

varn=n1+1ehvkT–1

Explanation:

This is Einstein's equation.

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