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ser-zykov [4K]
3 years ago
10

which of these statements best compares the processes by which energy is produced in the sun and nuclear power plants? a. atoms

fuse in the sun, but atoms break up in nuclear power plants. b. atoms break up in the sun, but atoms fuse in nuclear power plants. c. atoms of elements in the sun expand to emit heat and nuclear energy. d. atoms of elements in the sun contract to emit heat and nuclear energy.
Physics
2 answers:
11Alexandr11 [23.1K]3 years ago
5 0

Answer:

A. Atoms fuse in the sun, but break up in nuclear power plants.

Explanation:

In the Sun occurs a phenomenon called Nuclear Fusion, there a massive fusion reaction is constantly occurring with the presence of hydrogen and helium.

On the other hand, nuclear power plants collide neutrons against uranium atoms to split them. So, this split provide neutrons from uranium, which collide with other atoms causing a chain reaction, releasing high power energy.

Harlamova29_29 [7]3 years ago
3 0
A. atoms fuse in the sun, but atoms break up in nuclear power plants.

The process in the Sun is a Fusion Process, atoms are fused, while the process in nuclear power plant is a Fission Process, atoms break up. 
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John traveled East at 10 m/s for ten
NNADVOKAT [17]

Answer:

Option D

130 m

Explanation:

From the concept of speed, distance=speed*time

When traveling East, displacement=10*10=100 m (since he takes 10 seconds while traveling at a speed of 10 m/s)

When traveling West, displacement=5*6=30 m (since John takes 6 seconds to travel at a speed of 5 m/s)

Total displacement=Displacement East+ Displacement West=100+30=130 m

5 0
3 years ago
A neighborhood transformer on the top of a utility pole transforms 12.0 kV 60.0 Hz alternating voltage down to 120.0 V to be use
riadik2000 [5.3K]

Answer:

<em>The primary coil has 13,400 turns</em>

Explanation:

<u>Voltage Transformers</u>

A transformer is an electrical apparatus that converts an alternating electrical voltage to another. Step-down transformers lower the voltage from higher levels (kilovolts) to consumer levels (120/240 Volts).

The ratio between both voltages can be computed as

\displaystyle r=\frac{V_1}{V_2}

Where V1 is the primary voltage and V2 is the secondary voltage. This ratio depends on the turns ratio of the coils wounded in a common magnetic core.

\displaystyle r=\frac{N_1}{N_2}

Being N1 the number of turns of the coils of the primary side and N2 the number of turns in the secondary coil. Both relations give us

\displaystyle \frac{N_1}{N_2}=\frac{V_1}{V_2}

Solving for N1

\displaystyle N_1=\frac{V_1}{V_2}\cdot N_2

We have:

V_1=12,000\ V\\V_2=120\ V\\N_2=134

Calculate N1

\displaystyle N_1=\frac{12,000}{120}\cdot 134=13,400

The primary coil has 13,400 turns

8 0
3 years ago
A proton moves perpendicularly to a uniform magnetic field b with a speed of 3.7 × 107 m/s and experiences an acceleration of 5
svlad2 [7]
The magnetic force experienced by the proton is given by
F=qvB \sin \theta
where q is the proton charge, v its velocity, B the magnitude of the magnetic field and \theta the angle between the direction of v and B. Since the proton moves perpendicularly to the magnetic field, this angle is 90 degrees, so \sin \theta=1 and we can ignore it in the formula.

For Netwon's second law, the force is also equal to the proton mass times its acceleration:
F=ma

So we have
ma=qvB
from which we can find the magnitude of the field:
B= \frac{ma}{qv}= \frac{(1.67 \cdot 10^{-27}kg)(5\cdot 10^{13}m/s^2)}{(1-6 \cdot 10^{-19}C)(3.7 \cdot 10^7 m/s)}=0.014 T
4 0
3 years ago
Help with these three
Elenna [48]
The first: alright, first: you draw the person in the elevator, then draw a red arrow, pointing downwards, beginning from his center of mass. This arrow is representing the gravitational force, Fg.
You can always calculate this right away, if you know his mass, by multiplying his weight in kg by the gravitational constant
g = 9.81 \frac{m}{s {}^{2} }
let's do it for this case:
f_{g}  = m \times g \\ f _{g}  = 65kg \times 9.81 \frac{m}{s {}^{2} }  = 637.65
the unit of your fg will be in Newton [N]
so, first step solved, Fg is 637.65N
Fg is a field force by the way, and at the same time, the elevator is pushing up on him with 637.65N, so you draw another arrow pointing upwards, ending at the tip of the downwards arrow.
now let's calculate the force of the elevator
f = m \times a \\ f = 65 \times 5 \frac{m}{s {}^{2} }  \\ f = 325n
so you draw another arrow which is pointing downwards on him, because the elevator is accelating him upwards, making him heavier
the elevator force in this case is a contact force, because it only comes to existence while the two are touching, while Fg is the same everywhere
8 0
3 years ago
The ballistic pendulum is a device used to measure the speed of a projectile such as a bullet. The projectile of mass m is fired
My name is Ann [436]

Answer:

Relation between initial speed of bullet and height h is given as

v = \frac{m + M}{m}\sqrt{2gh}

Explanation:

As we know that system of block and bullet swings up to height h after collision

So we have

(m + M)gh = \frac{1}{2}(m + M)v_1^2

so we have

v_1 = \sqrt{2gh}

so speed of the block + bullet just after the impact is given by above equation

Now we also know that there is no force on the system of bullet + block in the direction of motion

So we can use momentum conservation

mv = (m + M)v_1

now we have

v = \frac{m + M}{m}\sqrt{2gh}

5 0
3 years ago
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