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BARSIC [14]
2 years ago
7

Pls answer this

Physics
1 answer:
igor_vitrenko [27]2 years ago
6 0

Answer:

37.8225 J

Explanation:

kinetic energy = 1/2 of mass x velocity^{2}

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Q1.
Vesnalui [34]

Answer:

P = 450 J

Explanation:

Given that,

Mass of a child, m = 18 kg

The vertical distance from the top to the bottom of the slide is 2.5 metres.

The Gravitational field strength = 10 N/kg

We need to find the decrease in gravitational potential energy of the child sliding from the  top to the bottom of the slide.

The formula for the gravitational potential energy is given by :

P = mgh

Substituting all the values,

P = 18 kg × 10 m/s² × 2.5 m

P = 450 J

Hence, the decrease in gravitational potential energy is 450 J.

4 0
2 years ago
4. What is the acceleration of a plane that changes velocity from 75 m/s to
kompoz [17]

Answer:

a =  \frac{v - u}{t}  \\ s =  \frac{ {v}^{2} -  {u}^{2}  }{2a}

Explanation:

Apply SUVAT

4 0
3 years ago
9. To completely describe the motion of an object, you need
pav-90 [236]
I think it’s D) all of the above
4 0
3 years ago
Read 2 more answers
What is the common formula for work? Assume that W is the work, F is a constant force, 656-06-01-00-00_files/i0060000.jpgv is th
klio [65]
The common formula for work is:
Work = force x displacement
W = F x d
6 0
3 years ago
Question 1: Bicycle pump
belka [17]

Answer: The pressure  of the air when compressed is 5.0\times 10^5Pa

Explanation:

Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.

P\propto \frac{1}{V}     (At constant temperature and number of moles)

P_1V_1=P_2V_2  

where,

P_1 = initial pressure of gas  = 1.0\times 10^5Pa

P_2 = final pressure of gas  =?

V_1 = initial volume of gas  = V

V_2 = final volume of gas  = \frac{V}{5}

1.0\times 10^5\times V=P_2\times \frac{V}{5}  

P_2=5.0\times 10^5Pa

Therefore, the pressure  of the air when compressed is 5.0\times 10^5Pa

4 0
3 years ago
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