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zhenek [66]
4 years ago
12

The acceleration due to gravity is lower on the Moon than on Earth. Which one of the following statements is true about the mass

and weight of an astronaut on the Moon's surface, compared to Earth? The acceleration due to gravity is lower on the Moon than on Earth. Which one of the following statements is true about the mass and weight of an astronaut on the Moon's surface, compared to Earth? Both mass and weight are less. Mass is less, weight is the same. Both mass and weight are the same. Mass is the same, weight is less.
Physics
1 answer:
VashaNatasha [74]4 years ago
3 0

Answer:

Mass is the same, weight is less.

Explanation:

We know the following equation

W = mg

where m is the mass of the astronaut which is constant and W is the weight. As g (the acceleration due to gravity) is a variable which it is directly proportional to the W, if g is lower on the Moon than on Earth, then W is lower on the Moon than on Earth.

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8 0
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Answer:

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4 years ago
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5 0
3 years ago
An electric heater supplies 5kw of power to atank of water assume all the energy supplied is converted into heat energy and the
kicyunya [14]

Answer:

<em>8hours 45minutes</em>

Explanation:

Amount of heat energy used up by the electric substance = heat gained by the water.

Amount of heat energy used up by the electric substance = Power * Time

heat gained by the water. = mcΔt

m is the mass of the water in kg

c is the specific heat capacity

Δt is the change in temperature

Given parameters

Power = 5kW = 5000W

mass of water m = 500kg

c = 4200J/kgC

Δt = 100°C - 25°C = 75°C

Required

Time taken

Substituting the given parameters into the formula

Pt = mcΔt

5000t = 500*4200*75

5000t = 157,500,000

Divide both sides by 5000

t =  157,500,000/5000

t = 31,500 secs

t = (31,500/3600)hrs

t = 8.75hours

t = 8hours 45minutes

<em>Hence it takes 8hours 45minutes to heat 500 kg of water in the tank from 25c to 100c</em>

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6 0
4 years ago
on a Powerline birds can enjoy sitting from one live wire to the other. However,if a person touches it,then the person will die
Alika [10]

Answer:

Due to potential difference (elaborated in explanation)

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When a bird sits on a power line, its whole body is in contact with the power line. It does not have any contact with the ground or anything at a lower potential. Hence, the current does not flow through the bird's body, because there is no potential difference available as a driving force.

Now, when a person touches the power line his hand is at a higher potential provided by the power line, while the rest of his body is connected to the ground, usually through legs. The current always looks for a path from high potential to low potential. Therefore, the body of the person serves as the path for the current. Heavy current flows through the body and the person dies within split seconds.

7 0
3 years ago
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