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3 years ago

Key Stage 3 Science - Physics

Physics

1 answer:

stira [4]3 years ago

5 0

Answer:

F = 3750 N

Explanation:

Given that,

Pressure, P = 150 Pa

Area, a = 25m²

We need to find the force applied. We know that, pressure is equal to the force acting per unit area. It can be given by :

$P=\dfrac{F}{A}\\\\F=P\times A\\\\F=150\ Pa\times 25\ m^2\\\\F=3750\ N$

So, the required force is 3750 N.

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A student throws a water balloon with speed v0 from a height h = 1.82 m at an angle θ = 29° above the horizontal toward a target

3241004551 [841]

Answer:

$v_o = 7.76 m/s$

Explanation:

As we projected the balloon at speed vo at an angle of 29 degree

so the two component of velocity is given as

$v_x = v_ocos29 = 0.875 v_o$

$v_y = v_o sin29 = 0.485 v_o$

now we know that in x direction we have

$d = v_x t$

$7.5 = 0.875 v_o t$

$v_o t = 8.57$

in y direction we have

$- 1.82 = (0.485 v_o) t - \frac{1}{2}gt^2$

$-1.82 = 0.485(8.57) - 4.9 t^2$

$t = 1.1 s$

now we have

$v_o = 7.76 m/s$

7 0

4 years ago

In a recent year, wind machines in a country generated 183.1 billion kWh of electricity, enough to serve over 17 million househo

Neko [114]

Answer:

The right answer is "4.4%".

Explanation:

Given:

Generated electricity,

= 183.1 billion kWh

Total electricity production,

= 4098 billion kWh

Now,

The wind energy percentage will be:

= $\frac{183.1}{4098}\times 100$

= $0.0446\times 100$

= $4.4$ %

5 0

3 years ago

From your data, what factor(s) affect the speed of a wave? Explain your reasoning.

strojnjashka [21]

wavelength frequency and other

Explanation:

Waves travel through a medium: A medium is any substance or region through which a wave is transmitted. The speed of a wave is dependant on four factors: wavelength, frequency, medium, and temperature. Wave speed is calculated by multiplying the wavelength times the frequency (speed = l * f).

3 0

3 years ago

a gas has an initial volume of 2.4 L at a pressure of 1.5 ATM and a temperature of 273 K the pressure of the gas is increased to

11Alexandr11 [23.1K]

The final volume of the gas is still 2.4 L, unless you also move it into a different jar or tank. A gas always fills whatever container it's in.

6 0

3 years ago

Read 2 more answers

PLEASE HELP (100)

morpeh [17]

Answer:

The work done will be $W=55.27\: J$