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irina1246 [14]
3 years ago
11

While hammering a nail, you put in 30 Joules of work. The hammer then puts out 10 J of

Physics
2 answers:
Fynjy0 [20]3 years ago
8 0

Answer:

I think its 40%, pls correct me if I am wrong :(

Explanation:

AfilCa [17]3 years ago
3 0

Answer:

C    Don't worry if you thought it was D. I almost answered that.

Explanation:

Remark

You can get this just by learning the vocabulary.

Efficiency = Work Out / Work In * 100%

Work in = 30J      That's you swinging the hammer.

Work out = 10 J    That's how much of the hammer's work gets to the nail.

Efficiency = (10/30)*100

Efficiency = 1/3 * 100

Efficiency = 33%

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Answer:

PE = 3.92x10^16J

potential energy

Explanation:

PE = m*g*h

mass of water = 1000kg/m³

(4*10^10m³)*1000kg = 4*10^13kg

PE = (4*10^13kg)*(9.81m/s²)*(100m)

PE = 3.92x10^16J

7 0
3 years ago
Two resistors of 2 ohms each are connected in parallel, another resistor of 1 ohm is connected in series with the parallel combi
insens350 [35]

Answer:

The power dissipated in either one of the parallel resistors is 2 V

Explanation:

Given;

two parallel resistors, R₁ and R₂ = 2 ohms

The total resistance of the Two resistors of 2 ohms connected in parallel is;

R_T = \frac{R_1R_2}{R_1+R_2} = \frac{2*2}{2+2} = \frac{4}{4} = 1 \ ohm

when connected to another resistor  of 1 ohm in series, the total resistance becomes;

Rt = R₁ + R₂

Rt = 1 + 1 = 2 ohms

Current in the circuit, I = voltage / total resistance

                                      = 2 /2 = 1 A

the overall circuit has been resolved to series connection, and current flow in series circuit is constant.

Power = I²R

Thus,  power dissipated in either one of the parallel 2 ohms resistors is;

Power = I²R = (1)² x 2 = 2 V

3 0
3 years ago
Hydraulic press is a force multiplier . show mathematically
Vadim26 [7]
Yes it’s is a force multiplier
5 0
4 years ago
Identify an object that is similar to the shape of a planet.
lbvjy [14]
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6 0
3 years ago
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Intensity: Radiation of a single frequency reaches the upper atmosphere of the earth with an intensity of 1350 W/m2. What is the
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Answer:

The right answer is "1010 V/m".

Explanation:

The given values are:

Intensity,

I=1350 \ W/m^2

c = 3.00\times 108 \ m/s

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Now,

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=  \sqrt{2\times u\times c\times I}

On substituting the values in the above formula, we get

=  \sqrt{2\times 4\times \pi\times 10^{-7}\times 3\times 10^8\times 1350}

=  \sqrt{32400\times 3.14\times 10^{-7}\times 10^8}

=  1010 \ V/m

3 0
3 years ago
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