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Alecsey [184]
3 years ago
13

A weight lifter raises a 1600 N barbell to a height of 2.0 meters. How much work was done? W = Fd

Physics
2 answers:
-Dominant- [34]3 years ago
3 0
D) 3200 joules is the answer
Naya [18.7K]3 years ago
3 0

Answer : Work done, W = 3200 Joules.

Explanation :

The force acting on the berbell, F=1600\ N

The height attained by it, h=2\ m

We know that the relation between the work done, force acting and the displacement is given by :

W=F\times d

W=1600\ N\times 2\ m

W=3200\ Joules

The work done will be 3200 Joules.

So, the correct option is (D).

Hence, this is the required solution.

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a radio antenna broadcasts a 1.0 MHz radio wav e with 21 kW of power. Assume that the radiation is emitted uniformly in all dire
My name is Ann [436]

Answer:

I=2.67\times 10^{-6}\ W/m

Explanation:

Given that,

Frequency of a radio antenna is 1 MHz

Power, P = 21 kW

We need to find the the waves intensity 25 km from the antenna . The object emits intenisty evenly in all direction. It can be given by :

I=\dfrac{P}{4\pi r^2}\\\\I=\dfrac{21\times 10^3}{4\pi (25000)^2}\\\\I=2.67\times 10^{-6}\ W/m

So, the wave intensity 25 km from the antenna is 2.67\times 10^{-6}\ W/m.

5 0
3 years ago
The average density of the body of a fish is 1080 kg/m3. To keep from sinking, the fish increases its volumeby inflating an inte
Dimas [21]

Answer:

f = 8 %

Explanation:

given,

density of body of fish = 1080 kg/m³

density of air = 1.2 Kg/m³

density of water = 1000 kg/m²

to protect the fish from sinking volume should increased by the factor f

density of fish + density of water x increase factor = volume changes in water                                                    

1080 +f x 1.2 =(1 + f ) x 1000                

1080 + f x 1.2 = 1000 + 1000 f      

998.8 f = 80                                  

f = 0.0800                            

f = 8 %                                        

the volume increase factor of fish will be equal to f = 8 %

7 0
3 years ago
How does sound travel from its source to your ear?
swat32
B. By vibrations in wires or strings
5 0
3 years ago
Read 2 more answers
What is the correct explanation of Newton's Third Law of Motion?
viva [34]

Answer:

a

Explanation:

it explains the most, and it is the correct theorem

8 0
3 years ago
Read 2 more answers
Please help on this one?
djyliett [7]
It’s C
Cause Impulse is found by multiplying the force and change in time (which is simply time)
So if you rearrange the equation for time you end up dividing Impulse by force.
3 0
3 years ago
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