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3 years ago

A dog of mass 4 kg runs up a hill of height 8 m. How much gravitational potential energy does the dog gain?

2 answers:

8 0

A. 314 because when you use the formula for the GPE ; GPE=MGH or means mass times gravity time height (4x8x9.8) and thats equivalent to 313.6 which rounds up to 314. Hope it helps

Scrat [10]3 years ago

6 0

Answer:

The gravitational potential energy is 314 J.

(A) is correct option.

Explanation:

Given that,

Mass of dog = 4 kg

Height = 8 m

We need to calculate the potential energy

Using formula of potential energy

$P.E = mgh$

m = mass

g = acceleration due to gravity

h = height

Put the value into the formula

$P.E=4\times9.8\times8$

$P.E=313.6=314\ J$

Hence, The gravitational potential energy is 314 J.

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Answer:

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3 years ago

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3 years ago

What is the half-life of a compound if 75 percent of a given sample of the compound decomposes in 60 min? assume first-order kin

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The amount left of a given substance can be calculated through the equation,
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3 years ago

A crane exerts a net force of 900 N upward on a 750-kilogram car as the crane starts to lift the

Darya [45]

The acceleration of the car is $1.2 m/s^2$ upward

Explanation:

We can solve the question by using Newton's Second Law of motion, which states that:

$F=ma$

where

F is the net force exerted on an object

m is the mass of the object

a is its acceleration

In this problem, we know that:

F = 900 N is the net force exerted on the car

m = 750 kg is the mass of the car

Solving the equation for a, we find the acceleration of the car:

$a=\frac{F}{m}=\frac{900}{750}=1.2 m/s^2$

and it is in the same direction as the force (upward).

Learn more about Newton's second law of motion here:

brainly.com/question/3820012

#LearnwithBrainly

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3 years ago

Part F A system experiences a change in internal energy of 14 kJkJ in a process that involves a transfer of 36 kJkJ of heat into

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Answer:

Explanation:

According to first law of thermodynamics :

Q = ΔE + W

Q is heat added , ΔE is increase in the internal energy of the system and W is work done by the system .

Here Q = 36 KJ

ΔE = 14 kJ

Putting the values in the equation

36 = 14 + W

W = 36 - 14

= 22 kJ .

Work done by gas or system = 22 kJ.

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3 years ago