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exis [7]
3 years ago
5

Mr.pointer has as mass of 50kg. his is at the top of a 10m hill. what is his PE

Physics
1 answer:
iragen [17]3 years ago
6 0

Answer:

PE=4900J

Hope it helps please mark me as brainliest

Explanation:

P.E=m×g×h

Given m = 50 Kg , h = 10 m.

P.E=50×10×9.8

P.E=50×98=4900J

Hence increase in potential energy is 4900J.

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The car travels 52m in 21 seconds before it comes to a complete stop after the driver applies the brakes. What was the car's ini
prisoha [69]

Answer:

2.48 m/s

Explanation:

D=vt

52 = V 21

V= 52/21=2.47m/s

5 0
3 years ago
The total circuit resistance of a parallel circuit is always ________ the lowest resistance present in any branch of the circuit
solniwko [45]
The answer is "less than".
3 0
3 years ago
As more lamps are put into a series circuit, the overall current in the circuit a. Increasesb. Decreasesc. Remains the same
erik [133]

Answer:

b. Decreases

Explanation:

The total resistance of a series circuit is equal to the sum of the individual resistances:

R_T=R_1+R_2+...+R_n (1)

Therefore, as we add more lamps, the total resistance increases (because we add more positive tems in the sum in eq.(1).

The current in a circuit is given by Ohm's law:

I=\frac{V}{R_T}

where V is the voltage provided by the power source and R_T is the total resistance. We notice that the current, I, is inversely proportional to the total resistance: therefore, when more lamps are added to the series circuit, the total resistance increases, and therefore the current in the circuit decreases.

8 0
3 years ago
In your own words explain how energy is involved in physical changes and in chemical changes
olasank [31]

Answer:

All adjustments in issue include changes in energy. Energy is either delivered or consumed. The energy is often in the form of heat, however it might be in the form of sound or light.

Explanation:

this is in my own words btw:)

8 0
3 years ago
A boat crossing a 153.0 m wide river is directed so that it will cross the river as quickly as possible. The boat has a speed of
irinina [24]

Answer:

201.76266192 m

Explanation:

Distance traveled in the horizontal direction = 153 m

In the vertical direction the distance traveled

\dfrac{4.9\times 153}{5.7}=131.526315789\ m

Total distance from pythagoras theorem

d=\sqrt{153^2+(\dfrac{4.9\times 153}{5.7})^2}\\\Rightarrow d=201.76266192\ m

The total distance the boat will travel to reach the opposite shore is 201.76266192 m

6 0
3 years ago
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