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nordsb [41]
3 years ago
10

For each of the following statements determine whether it is correct or incorrect.

Physics
1 answer:
Mrac [35]3 years ago
7 0

Answer:

a) T; b) F; c) F; d) T; e) T; f) T

Explanation:

a) True, since the equation of work done on a spring is \frac{kx^2}{2}

b) False, it will be only mgh.

c) False, since it is mv^2, no direction involved.

d) True, since the measured speed of objects depends from the reference frame of the observer.

e) True, since its formula is mv^2 and both terms are positive.

f) True, since the centripetal force the Earth feels, which is the gravitational atraction the Sun exerts, is perpendicular to its circular trajectory.

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Please Help! When a metal is heated, the free electrons gain _____________.
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It’s B potential energy
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3 years ago
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What is meant by Compression and Rarefaction of a longitudinal wave?
Zepler [3.9K]
However instead of crests and troughs, longitudinal waves have compressions and rarefactions. Compression. A compression is a region in a longitudinal wave where the particles are closest together. Rarefaction. A rarefaction is a region in a longitudinal wave where the particles are furthest apart.
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3 years ago
a car slows down from 22 m/s to 3 m/s at a constant rate of 3.5 m/s squared. how many seconds are required before the car is tra
Stolb23 [73]

Answer:

9.05 s

Explanation

v=u+at

6 0
3 years ago
Each second, 1250 m3 of water passes over a waterfall 150 m high. Three-fourths of the kinetic energy gained by the water in fal
mote1985 [20]

Answer:

The generator produces electrical energy at a rate of 1378125000 J per second.

Explanation:

volume of water falling each second is 1250 m^{3}

height through which it falls, h is 150 m

mass of 1 m^{3} of water is 1000 kg

⇒mass of 1250 m^{3} of water, m = 1250×1000 = 1250000 kg

acceleration due to gravity, g = 9.8 \frac{m}{sec^{2} }

in falling through 150 m in each second, by Work-Energy Theorem:

Kinetic Energy(KE) gained by it = Potential Energy(PE) lost by it

⇒KE = mgh

        = 1250000×9.8×150 J

        = 1837500000 J

Electrical Energy = \frac{3}{4}(KE)

                            = \frac{3}{4}×1837500000

                            = <u>1378125000 J per second</u>

8 0
3 years ago
The sunspot cycle is a pattern of solar activity where the average number of sunspots gradually _______________________________
zzz [600]

Answer:

option D

Explanation:

Sunspots are the spot that appears on the sun, this spot appears darker than the surrounding surface of the sun.

Sun magnetic field goes through a cycle and this cycle is called the Sunspot cycle. Every 11 years the magnetic field of the sun completely flips. This sunspot cycle affects activity on the surface of the sun.

Sunspot cycle is the pattern of solar activity where an average number of sunspot gradually increase and decrease.

Hence, the correct answer is option D

8 0
3 years ago
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