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3 years ago

What is the definition of physical activity?

Physics

2 answers:

DiKsa [7]3 years ago

3 0

Physical activity is defined as any bodily movement produced by skeletal muscles that requires energy expenditure.

Ede4ka [16]3 years ago

3 0

Answer:

The answer is Movement produced by skeletal muscles

Explanation :

Physical activity is all body movement produced by skeletal muscles and which is accompanied by energy consumption. Now, we talk about physical activity when we run, swim, jump, ride a bike, among others; also the daily activities of the house such as going up and down stairs, dancing, gardening activities, cooking.

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A brick sits on the top of a hill with a gravitational potential energy of 245 J. To determine the gravitational potential of th

Bogdan [553]

Answer:

The mass of the object, its acceleration due to gravity and the distance between the top of the hill and the ground level.

Explanation:

gravitational potential energy is the energy possessed by a body under influence of gravitational force by virtue of its position.

In order to determine the gravitational potential energy of the brick, we must know the mass (m) of the brick, its acceleration due to gravity (g) since it is acting under the influence of gravitational force and the distance between the top of the hill and the ground level. (The height).

Potential energy of a body is calculated as mass × acceleration due to gravity × height.

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3 years ago

Which is an example of transforming potential energy to kinetic energy? Select two options

blsea [12.9K]

Answer : 

.changing chemical energy to thermal energy

.changing nuclear energy to radiant energy

Explanation : 

<h3>Hope it helps you mate ))</h3>

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3 years ago

A motor does 20. joules of work on a block, accelerating the block vertically upward. Neglecting friction, if the gravitational

Eva8 [605]

The motor does 20 J of work on the block, it means that the total mechanical energy of the block has increased by 20 J. But the increase in total mechanical energy is equal to the sum of the increases in potential energy and kinetic energy:
$\Delta E = \Delta U + \Delta K$
So, if the gravitational potential energy has increased by 15 J, the kinetic energy has increased by
$\Delta K = \Delta E - \Delta U = 20 J - 15 J= 5 J$

4 0

3 years ago

Describe the effect of speed on voltage

11Alexandr11 [23.1K]

Answer:

Speed has no effect on voltage.

Explanation:

The voltage of the battery in your car is always 12 to 13.5 volts. It makes no difference whether the car is home in the garage or zooming down the interstate.

6 0

3 years ago

A wheel at rest gains an angular momentum of 10.7kgm²/s in 8s. if the moment if inertia of the wheel is 2.2kgm², how many revolu

EleoNora [17]

Answer:

Revolutions made before attaining angular velocity of 30 rad/s:

θ = 3.92 revolutions

Explanation:

Given that:

L(final) = 10.7 kgm²/s

L(initial) = 0

time = 8s

<h3>Find Torque:</h3>

Torque is the rate of change of angular momentum:

$T = \frac{L(final)-L(initial)}{t}\\T = \frac{10.7-0}{8}\\T=1.34 Nm$

<h3>Find Angular Acceleration:</h3>

We know that

T = Iα

α = T/I

where I = moment of inertia = 2.2kgm²

α = 1.34/2.2

α = 0.61 rad/s²

We know that angular equation of motion is:

ω²(final) = ω²(initial) +2αθ

(30 rad/s)² = 0 + 2(0.61 rad/s²)θ

θ = (30 rad/s)²/ 2(0.61 rad/s²)

θ = 24.6 radians

Convert it into revolutions:

θ = 24.6/ 2π

θ = 3.92 revolutions

3 0

3 years ago