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2 years ago

Which statement best describes an insulator?

Physics

2 answers:

Zarrin [17]2 years ago

6 0

Answer: It has a high resistivity because it opposes the movement of electrons.

Explanation: I know this because I jus took the test & picked c thinking tht this person got it right but it was actually wrong‍♀️

jolli1 [7]2 years ago

5 0

Answer:

It has a high resistivity because it permits the movement of

electrons.

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Which sI units are combined to describe force?

Reptile [31]

Answer:

Symbol N

Explanation:

The SI unit of force is the newton, symbol N

3 0

2 years ago

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A heat engine operating at steady state delivers a power output of 15.5 hp. The engine receives energy by heat transfer in the a

Anna007 [38]

Answer:

w_cycle = 13.68 KJ / cycle

Explanation:

Given:

- Steady power out-put W_out = 15.5 hp

- System executes 50 cycles/min

Find:

Determine the amount of work that is delivered during each cycle in kilo-joules

Solution:

- First we will convert the steady output into KW as follows:

W_out = 15.5 hp

The conversion factor is 1.36 KW per hp.

W_out = 15.5 [hp] * [KW] / 1.36 [hp]

W_out = 11.4 [KW] or [KJ/s]

- Given that there are 50 cycles in 60 sec. We will use direct proportionality to calculate the number of cycles per second:

50 cycles -----------> 60 s

x cycles -----------> 1 s

x = 50/60 = 0.8333 cycles /s

- Next we will compute the amount of work done per cycle:

w_cycle = W_out / x

w_cycle = 11.4 [KJ/s] * [s] / 0.8333 [cycles]

w_cycle = 13.68 KJ / cycle

7 0

2 years ago

An proton-antiproton pair is produced by a 2.20 × 10 3 MeV photon. What is the kinetic energy of the antiproton if the kinetic e

timama [110]

Answer:

K = 80.75 MeV

Explanation:

To calculate the kinetic energy of the antiproton we need to use conservation of energy:

$E_{ph} = E_{p} + E_{ap} = E_{0p} + K_{p} + E_{0ap} + K_{ap} = m_{0p}c^{2} + K_{p} + m_{0ap}c^{2} + K_{ap}$

<em>where $E_{ph}$ : is the photon energy, $E_{0p} and E_{0ap}$ : are the rest energies of the proton and the antiproton, respectively, equals to m₀c², $K_{p} and K_{ap}$ : are the kinetic energies of the proton and the antiproton, respectively, c: speed of light, and m₀: rest mass.</em>

Therefore the kinetic energy of the antiproton is:

$K_{ap} = E_{ph} - m_{0p}c^{2} - K_{p} - m_{0ap}c^{2}$

<u>The proton mass is equal to the antiproton mass, so</u>:

$K_{ap} = E_{ph} - 2m_{0p}c^{2} - K_{p}$

$K_{ap} = 2.20 \cdot 10^{3}MeV - 2(1.67 \cdot 10^{-27}kg)(3\cdot 10^{8} \frac {m}{s})^{2} - 242.85MeV$

$K_{ap} = 2.20 \cdot 10^{3}MeV - 2(1.67 \cdot 10^{-27}kg)(3\cdot 10^{8} \frac {m}{s})^{2}(\frac{1eV}{1.602 \cdot 10^{-19}J})(\frac{1 MeV}{10^{6}eV}) - 242.85MeV$

$K_{ap} = 80.75 MeV$

Hence, the kinetic energy of the antiproton is 80.75 MeV.

I hope it helps you!

3 0

2 years ago

A _____ has to do with the direction of a force

Elenna [48]

Answer:

The "solid force"? ... The direction of the force always seems to be coming out of the solid surface. A direction which is perpendicular to the plane of a surface is said to be normal. The force that a solid surface exerts on anything in the normal direction is called the normal force.

Explanation:

i think i hope this helps

3 0

2 years ago

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Which two optical devices use convex lenses to focus and enlarge images?

Andreas93 [3]

It is a reflecting telescope and a compound microscope. I know this for sure

4 0

2 years ago