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3 years ago

Potential energy increases with the greater height mass of an object.True or False

Physics

1 answer:

guapka [62]3 years ago

5 0

Answer:

Potential energy increases with the greater height mass of an object.

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Calculate the force exerted on this test dummy with a mass of 75 kg hits an air bag accelerating at 12 m/s2.

maksim [4K]

Answer: 900

Explanation: Force equals mass x acceleration F=M×A

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3 years ago

In an experiment, a rectangular block with height h is allowed to float in two separate liquids. In the first liquid, which is w

Amiraneli [1.4K]

Answer:

The relative density of the second liquid is 7.

Explanation:

From archimede's principle we know that the force that a liquid exerts on a object equals to the weight of the liquid that the object displaces.

Let us assume that the volume of the object is 'V'

Thus for the liquid in which the block is completely submerged

The buoyant force should be equal to weight of liquid

Mathematically

$F_{buoyant}=Weight\\\\\rho _{1}\times V\times g=m\times g\\\\\therefore \rho _{1}=\frac{m}{V}...............(i)$

Thus for the liquid in which the block is 1/7 submerged

The buoyant force should be equal to weight of liquid

Mathematically

$F'_{buoyant}=Weight\\\\\rho _{2}\times \frac{V}{7}\times g=m\times g\\\\\therefore \rho _{2}=\frac{7m}{V}.................(ii)$

Comparing equation 'i' and 'ii' we see that

$\rho_{2}=7\times \rho _{1}$

Since the first liquid is water thus $\rho _{1}=1gm/cm^3$

Thus the relative density of the second liquid is 7.

6 0

3 years ago

Read 2 more answers

A child uses her hand to measure the width of a table too. Her hand has a width of 6.9 cm at its widest points, and she finds th

daser333 [38]

20/45/1 step by step explanation

4 0

2 years ago

Water flows on the inside of a steel pipe with an ID of 2.5 cm. The wall thickness is 2 mm, and the convection coefficient on th

Hatshy [7]

Answer:

U = 11.67 W/m² °C

Explanation:

Inner diameter, d = 2.5 cm = 0.025 m

Thickness of the wall, t = 2 mm = 0.002 m

thus, the outer diameter, D = d + 2t = 0.025 + 2 x 0.002 = 0.029 m

$h_i =500 W/m^2.^oC$

$h_0 =12 W/m^2.^oC$

Now, based on outside convection heat transfer

we have

$\frac{1}{UA_o}=\frac{1}{h_iA_i}+\frac{1}{h_oA_o}$

on rearranging, we get

$\frac{1}{U}=\frac{1}{h_i}\frac{A_o}{A_i}+\frac{1}{h_o}$

where, $A_i\ \textup{and}\ A_o$ are the perimeter respective to inner and and outer diameter

on substituting the values, we get

$\frac{1}{U}=\frac{1}{500}\frac{0.029^2}{0.025}+\frac{1}{12}$

U = 11.67 W/m² °C

6 0

3 years ago

Look at the circuit diagram. Which of these components is part of the circuit

Aneli [31]

You have not provided choices, therefore, I can not provide an exact choice.

However, I will tell you the components of the given circuit and you can choose the one found in the choices you have.

The given circuit is composed of:
1- A battery:
It has the symbol of the long line and short line next to each other. The long line represents the positive pole while the short line represents the negative one. Battery is used to supply power to the circuit
2- An ammeter:
If has the symbol of an "A" in a circle. This device is used to measure the current flowing in the circuit
3- A resistance:
It has the symbol of the zigzag line. Resistance could be any device that consumes the power in the circuit.
4- A switch:
This has the symbol of the line at the bottom of the circuit. In its current status, the switch is off which means that no current is flowing in the circuit. If we connect the open terminal of the switch with the circuit, the switch is said to be on and current would flow in the circuit.

Hope this helps :)

7 0

3 years ago

Read 2 more answers