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shusha [124]
3 years ago
10

a 60kg person climbs stairs of total height of 20m in two minutes calculate the power delivered [g = 10ms^2]​

Physics
1 answer:
Dafna11 [192]3 years ago
6 0
60*20 divided by 120
= 1200/120 = 10 WATT
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What is the heat capacity of an object at 25.5∘C that absorbs 45 kJ of heat and is heated to 28.2∘C?
sergey [27]

Answer:

16.6 kJ/°C

Explanation:

given,

Amount of heat absorbed = 45 kJ

initial temperature, T₁ = 25.5°C

final temperature, T₂ = 28.2°C

change in temperature = T₂ - T₁

                                       = 28.2 - 25.5  = 2.7° C

Heat\ capacity = \dfrac{Heat\ absorbed}{\Delta T}

Heat\ capacity = \dfrac{45\ kJ}{2.7}

Heat\ capacity = 16.6\ kJ/^0C

Heat capacity of the object is equal to 16.6 kJ/°C

4 0
4 years ago
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A 332 kg mako shark is moving in the positive direction at a constant velocity of 2.30 m/s along the bottom of a sea when it enc
Digiron [165]

To solve this problem we will apply the concepts related to the conservation of momentum. By definition we know that the initial moment must be equivalent to the final moment of the two objects therefore

p_1 = p_2

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Here,

m_{1,2} = Mass of each object

u_{1,2} = Initial velocity of each object

v_{1,2}= Final velocity of each object

Since the initial velocity relative to the metal tank is at rest, that velocity will be zero. And considering that in the end, the speed of the two bodies is the same, the equation would become

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Rearranging to find the velocity,

v_f = \frac{m_1u_1}{ (m_1+m_2)}

Replacing we have that,

v_f = \frac{(332)(2.3)}{ (332+19.5)}

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Therefore the velocity of the shark immediately after it swallows the tank is 2.17m/s

4 0
4 years ago
Which is not true of atoms
IgorLugansk [536]

Answer:

Explanation:

Atoms are the smallest constituent units of matter and they have properties of chemical elements. Atoms can not be broken by any chemical means. Atoms of an elements combine together to form compound. In addition atoms consist nucleus of positively charged protons, neutral neutrons with negatively charged electrons.

6 0
3 years ago
Butter melts when you heat it on a pan on the stove.is this a chemical changes or physical changes?
Stells [14]

Answer:

No chemical bonds are broken or formed in melting butter, so it is not a chemical change. The melting process is only a physical change, the change of state from solid to liquid.

5 0
4 years ago
Read 2 more answers
The change in velocity during a measurable time interval, divided by the time interval, is the _____.
scoray [572]
Hello!


Let's put it into symbols:

Change in velocity = \mathsf{V_f - V_i=\Delta V}
A measurable interval: \mathsf{\Delta t}

This division is:

\mathsf{\dfrac{\Delta V}{\Delta t}}

We can recognize this as the Average Acceleration \mathsf{a_m}
5 0
3 years ago
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