When farm animals eat the grass on land until there is almost no ground cover, it is called ______.

If we decrease the amount of force applied to an object, and all other factors remain the same, the amount of work completed will decrease.

Answer: Option A

<u>Explanation:</u>

When force pushes the body to move, it shows that work acts on the object. Work is the measure of transfer in energy when a force (F) pushes the object at a distance (d). After completing the task, energy is transferred from one energy storage device to another, therefore, energy transfer = work done.

The formula for work done is given as follows and expressed in joules (J),

From the above the equation, it clearly shows that work is directly proportionate to force. When keeping the other factors as constant, decrease in work leads to decrease in force also and vice versa.

Answer:

Sound waves are classified as <em>Longitudinal </em>waves. This means they move <em>longitude</em>, or sideways. A good way to think of it would be like a slinky moving sideways.

Answer:

7 K.

12. 6 °F

Explanation:

Convert the individual temperatures to Kelvin (Surface temperature and internal temperature) before calculating the temperature difference of the body,

Let The Surface temperature Be = X °C

And the internal Temperature will be = (X + 7) °C

Converting the surface and the internal temperature to temperature in Kelvin

Surface Temperature of the body (K) = (X + 273) K

Internal Temperature of the body (K) = (X + 7) + 273 = (X + 280) K.

∴ Temperature difference of the body (K) = Internal temperature(K) - surface temperature(K) = (X + 279) - (X + 280)

   = X - X + 280 - 273 = 7 K.

∴Temperature difference of the body (K) = 7 K

Also for Fahrenheit, Convert the individual temperatures (Surface temperature and internal temperature) to Fahrenheit before calculating the temperature difference of the body.

We use , F = 1.8C + 32

Where C = temperature in Celsius.

also,

Let The Surface temperature Be = X °C

And the internal Temperature of the body will be = (X + 7) °C

Converting to Fahrenheit

Surface Temperature of the body = 1.8X + 32 °F

Internal Temperature of the body = 1.8(X+7) + 32 = 1.8X + 12.6 + 32

Internal Temperature of the body = 1.8X + 44.6 °F

∴ The temperature difference of the body (°F) = Internal temperature(°F) - surface temperature(°F) = (1.8X + 44.6) - (1.8X + 32)

      surface temperature(°F) = 1.8X - 1.8X  + 44.6 - 32

       surface temperature(°F) = 12. 6 °F.

Answer:

The new electric field strength is 2E

Explanation:

The electric field between parallel plated can be calculated from the formula

E = V/d

Where E is the Electric field strength

V is the potential difference between the plates

and d is the separation between them

In the first instance where the electric field strength between the parallel plates is E. Let the potential difference (V) be V₁ and the separation between the plates (d) be d₁.

∴ E = V₁/d₁

Now, from the question

The separation of plate is doubled, that is, d = 2d₁

and potential difference between the plate is increased by factor of 4, that is, V = 4V₁

Then,

From E = V/d

Let the new electric field be E₂

Then,

E₂ = 4V₁/2d₁ = 2V₁/d₁

E₂ = 2(V₁/d₁)

E₂ = 2E

Hence, the new electric field strength is 2E.