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3 years ago

the natural radioactivity is done by(controlling the nuclear energy-no ability to control the nuclear energy-both of them)

Physics

1 answer:

just olya [345]3 years ago

5 0

Answer:

Nuclear power plants are fueled by uranium, which emits radioactive substances. Most of these substances are trapped in uranium fuel pellets or in sealed metal fuel rods. However, small amounts of these radioactive substances (mostly gases) become mixed with the water that is used to cool the reactor.

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Draw distance time grap for a body at rest

NARA [144]

It will be a straight horizontal line on the graph

4 0

4 years ago

Weigt A box sitting still on the ground by itself has a weight of 700N, what is the mass? (gravity's acceleration is 9.80 m/s2)

Alex

Force=700N
Acceleration=9.8m/s^2

Using newtons law

$\\ \rm\longmapsto F=ma$

$\\ \rm\longmapsto m=\dfrac{F}{a}$

$\\ \rm\longmapsto m=\dfrac{700}{9.8}$

$\\ \rm\longmapsto m=71.4kg$

7 0

3 years ago

Na figura, um bloco de massa igual a 5Kg é abandonado em repouso em um plano inclinado. Supondo que os coeficientes de atrito es

Law Incorporation [45]

The figure mentioned on the question is in the attachment.

Answer: a) $P_{x}$ = - 38.35N

b) $F_{N}$ = 30.5 N

c) $F_{f}$ = 27.45 N

d) a = - 13.16 m/s²

Explanation: A block on an inclined plane has 3 forces acting on it:

Force due to gravity $F_{g}$ = m.g;
Normal Force due to the plane;
Force of Friction $F_{f}$ = µ.N;

Since the plane is inclined, Normal Force is equal the y-component of the force due to gravity and Force of friction and the x-component of the force due to gravity are opposite forces.

The second attachment ilustrate the forces acting on the block.

Calculating:

A) The magnitude of the x-component of Force due to gravity:

According to the second image:

$P_{x}$ = P.sinθ

$P_{x}$ = 5.9.8.sin(36.8)

$P_{x}$ = - 38.35 N

B) $F_{N}$ = $P_{y}$ = m.g.cosθ

$F_{N}$ = 5.9.8.cos(36.8)

$F_{N}$ = 30.5 N

C) $F_{f}$ = 0.9.30.5

$F_{f}$ = 27.45 N

D) For the acceleration, use Newton's Law: $F_{R}$ = m . a

If there is movement, it is only on x-axis, so the net force is:

$P_{x}$ - $F_{f}$ = m.a

- 38.35 - 27.45 = 5a

a = - 13.16 m/s²

The value of acceleration shows there is <u>no</u> <u>movement</u> on the x-axis due to the friction.

7 0

3 years ago

A gas has a volume of 8.21 mL and exerts a pressure of 2.9 atm. What new volume will the gas have if the pressure is changed to

labwork [276]

Answer:

5.95 ml

Explanation:

Given info

P1=2.9 atm

V1=8.21 ml

P2=4 atm

From Boyle's law we know that p1v1=p2v2 where p and v are pressure and volume respectively. This is at a constant temperature. Making v2 the subject of formula then

V2=p1v1/p2

V2= 2.9*8.21/4=5.95 ml

3 0

3 years ago

A radar station sends out a 250000 Hz sound wave at a speed of 340 m/s. The sound wave bounces off a weather ballon and returns

Eddi Din [679]

Answers:

a)The balloon is 68 m away of the radar station

b) The direction of the balloon is towards the radar station

Explanation:

We can solve this problem with the Doppler shift equation:

$f'=\frac{V+V_{o}}{V-V_{s}} f$ (1)

Where:

$f=250,000 Hz$ is the actual frequency of the sound wave

$f'=240,000 Hz$ is the "observed" frequency

$V=340 m/s$ is the velocity of sound

$V_{o}=0 m/s$ is the velocity of the observer, which is stationary

$V_{s}$ is the velocity of the source, which is the balloon

Isolating $V_{s}$ :

$V_{s}=\frac{V(f'-f)}{f'}$ (2)

$V_{s}=\frac{340 m/s(240,000 Hz-250,000 Hz)}{240,000 Hz}$ (3)

$V_{s}=-14.16 m/s$ (4) This is the velocity of the balloon, note the negative sign indicates the direction of motion of the balloon: It is moving towards the radar station.

Now that we have the velocity of the balloon (hence its speed, the positive value) and the time ( $t=4.8 s$ ) given as data, we can find the distance:

$d=V_{s}t$ (5)

$d=(14.16 m/s)(4.8 s)$ (6)

Finally:

$d=68 m$ (8) This is the distance of the balloon from the radar station

6 0

3 years ago

the natural radioactivity is done by(controlling the nuclear energy-no ability to control the nuclear energy-both of them)​

the natural radioactivity is done by(controlling the nuclear energy-no ability to control the nuclear energy-both of them)