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3 years ago

Michael tells Sara he weighs 104 pounds. Sara says she is 44 kilograms. If there are 2.2 pounds in a kilogram, who is heavier?

Physics

2 answers:

Marizza181 [45]3 years ago

8 0

Sara is the correct answer

djyliett [7]3 years ago

4 0

Multiply 2.2 to 44 (which should give you 96.8). So, Michael is heavier.

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A spring whose spring constant is 270 lbf/in has an initial force of 100 lbf acting on it. Determine the work, in Btu, required

cricket20 [7]

Answer:

0.02585 BTU

Explanation:

Given: Spring constant, k = 270 lbf/in

Initial force, f =100 lbf

Compression, x = 1 in

Work done can be calculated as follows:

$W = \int {(f+kx)} \, dx \\W = fx + \frac{1}{2}kx^2\\W= (100 lbf)(1 in)+ \frac{1}{2}(270 lbf/in)(1 in)^2\\W= 100+135 = 235 lbf in\\W=235 \times 0.00011 BTU = 0.02585 BTU$

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Rashid [163]

If it is completely elastic, you can calculate the velocity of the second ball from the kinetic energy
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v1' = velocity of #1 after collision 
v2' = velocity of #2 after collision. 

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4 0

3 years ago

Read 2 more answers

Jin knows that the initial internal energy of a closed system is 78 J and the final internal energy is 180 J. He also knows that

lawyer [7]

As we know by the first law of thermodynamics

$Q = \Delta U + W$

here we know that

Q = heat given to the system

$\Delta U = U_f - U_i$

W = work done by the system

now here we can say

$\Delta U = 180 - 78 = 102 J$

$W = 64 J$

now we can say that heat will be given as

$Q = 64 + 102 = 166 J$

now here we can say that Jin does the error in his first step while calculation of change in internal energy as he had to subtract it while he added the two energy

So best describe Jin's Error is

B )For step 1, he should have subtracted 78 J from 180 J to find the change in internal energy.

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sergij07 [2.7K]

{Answer}
A- (10kg sphere and 30m)

{I hope this helps :) }

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2 years ago

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maria [59]

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Explanation:

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