3 years ago

“What is the relationship between wavelength and frequency?”

Physics

1 answer:

Kisachek [45]3 years ago

7 0

Answer:

They are inversely proportional. If the frequency goes up, the wavelength will go down

Explanation:

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The electric motor of a model train accelerates the train from rest to 0.685 m/s in 21.5 ms. The total mass of the train is 875

Natali [406]

Answer:

P=9.58 W

Explanation:

According to Newton's second law, and assuming friction force as zero:

$F_m=m.a\\F_m=0.875kg*a$

The acceleration is given by:

$a=\frac{\Delta v}{t}\\a=\frac{0.685m/s}{21.5*10^{-3}s}\\\\a=31.9m/s^2$

So the force exerted by the motor is:

$F_m=0.875kg*31.9m/s^2\\F_m=27.9N$

The work done by the motor is given by:

$W_m=F_m*d\\\\d=\frac{1}{2}*a*t^2\\d=\frac{1}{2}*31.9m/s^2*(21.5*10^{-3}s)^2\\\\d=7.37*10^{-3}m$

$W_m=27.9N*7.37*10^{-3}m\\W_m=0.206J$

And finally, the power is given by:

$P=\frac{W_m}{t}\\P=\frac{0.206J}{21.5*10^{-3}s}\\\\P=9.58W$

8 0

3 years ago

When expressing the unit for work, which of the following is the correct choice?

hram777 [196]

I need to write 20 characters but your answer is Joule

4 0

3 years ago

What is the condition to earths atmosphere at a givin time and pace

alina1380 [7]

The condition of earths atmosphere at a given time and place is the weather.

6 0

3 years ago

What maximum force do you need to exert on a relaxed spring with a 1.2×104-n/m spring constant to stretch it 6.0 cm from its equ

Elena L [17]

Answer:

Maximum force will be equal to 720 N

Explanation:

We have given that spring constant $k=1.2\times 10^4N/m$

Maximum stretch of the spring x = 6 cm = 0.06 m

We have to find the maximum force on the spring

We know that spring force is given by

$F=kx=1.2\times 10^4\times 0.06=720N$

So the maximum force which is necessary to relaxed the spring will be eqaul to 720 N

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4 years ago

While sitting in a moving bus you throw an apple up into the air. The apple will land back into your hand.

Neko [114]

False because you have moved after you through the apple in the air

6 0

3 years ago