PHYSICS HIGH SCHOOL

Name the physical quantity which changes contenously during uniform-circular motion.

Answers

Answer 1
Answer: The direction of the motion is constantly changing during
motion over any closed path, not only circular.

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What volume will a sample of copper 98.2 g occupy? the density of copper is 8.96 g/mL

Answers

The volume of a sample of copper of 98.2 g would be 10.95 ml if the density of copper is 8.96 g/mL.

What is density?

It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.

Due to their superior electrical and thermal conductivities, remarkable resistance to corrosion, and simplicity of production, copper alloys are frequently employed. In general, copper alloys are not magnetic. Electrical wire, cable, contacts, and other components.

As given in the problem the density of copper is 8.96 g/mL, and we have to find the volume occupied by the sample of copper.

mass = density×volume

98.2 g  = 8.96 g/mL×volume

volume =98.2/8.96

            =10.95 ml

Thus, the volume of a 98.2 g sample of copper would be 10.95 ml.

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Answer:

Density=mass/volume.

8.96=98.2/volume.

volume=98.2/8.96=10.95982143 ~ 11cm^3.

A swinging pendulum demonstrates what type of energy

Answers

The correct answer to the question is : Mechanical energy.

EXPLANATION:

Let us consider a pendulum which is raised to certain height. The energy possessed by the pendulum at this height is gravitational potential energy.

Let the pendulum is released. Now the potential energy of the pendulum is converted into kinetic energy. At the mean point, whole of its potential energy is converted into kinetic energy.

Due to inertia, the pendulum will overshoot its mean position and will move towards its extreme position. During its movement from mean point to extreme point, the kinetic energy is converted into potential energy. At extreme point, whole of its kinetic energy is converted into potential energy.

Hence, there is only energy conversion between kinetic energy and potential.

We know that sum total of kinetic energy and potential energy is called mechanical energy.

Hence, the correct answer is mechanical energy.
Potential and kinetic energy .

Light can travel through a medium, but it does not require a medium.
a. True
b. False

Answers


That's true.  Light can travel through glass, water or jello,
but it also gets here very effectively through empty space,
from the sun and stars.

A shorter electromagnetic wave is _____. more powerful less powerful hotter colder

Answers

Answer

more powerful 

Explanation
Electromagnetic waves are waves that do not require material medium for propagation. For example x-rays, UV and gamma rays.

From the wave equation, V= λf, when the wavelength is short the frequency is high. 
Frequency determines the intensity of the wave. When high the frequencies are high the waves has more penetrating power, hence more powerful. 

Answer:

More powerful

Explanation:

I answered it and got it right.

A mass of gas has a volume of 4m3, a temperature of 290k, and an absolute pressure of 475 kpa. When the gas is allowed to expand to 6.5m3, it's new temperature is 277K. What's the absolute pressure of the gas after expansion?

Answers

Given:

V1 = 4m3

T1 = 290k

P1 = 475 kpa = 475000 Pa

V2 = 6.5m3

T2 = 277K

Required:

P

Solution:

n = PV/RT

n = (475000 Pa)(4m3) / (8.314 Pa-m3/mol-K)(290k)

n = 788 moles

P = nRT/V

P  = (788 moles)(8.314 Pa-m3/mol-K)(277K)/(6.5m3)

P = 279,204 Pa or 279 kPa

What happens to ocean water as it moves from Antarctica to the equator

Answers

As they move water, ocean currents distribute heat and nutrients around the globe.                                                                                                                       

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