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just olya [345]
3 years ago
9

an object moves 2.21 m in the + x-direction under the influence of a 114 N force directed 43 degrees above the x-axis. Find the

work done on the object.
Physics
1 answer:
Nadusha1986 [10]3 years ago
3 0
Work = Force * distance
         = 114 N * 2.21m cos(43) 
         = 184.3 J
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Assume a change at the source of sound reduces the wavelength of a sound wave in air by a factor of 3.
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Explanation:

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Wavelength and frequency are inversely proportional to each other. So, if wavelength of a sound wave in air reduces by a factor of 3, then the frequency will increases by a factor of 3.

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(a) Calculate the height of a cliff if it takes 2. 35 s for a rock to hit the ground when it is thrown straight up from the clif
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(a) The height of the cliff will be 8.26 meters.

(b) The time would it take to reach the ground will be 0.717 sec.

<h3>What is velocity?</h3><h3 />

The change of displacement with respect to time is defined as the velocity. Velocity is a vector quantity. it is a time-based component.

(a) The height of the cliff will be 8.26 meters.

According to Newton's second equation of motion

\rm H =ut-\frac{1}{2} gt^2 \\\\ \rm H =8\times 2.35-\frac{1}{2} 9.81 (2.35)^2\\\\\rm H =8.16 \; m

Hence The height of the cliff will be 8.26 meters.

(b)The time would it take to reach the ground will be 0.717 sec.

We must have the final velocity to find the time so;

\rm v^2=u^2+2gh\\\\ \rm v^2=8^2+2\times 9.81 \times 8.6 \\\\ \rm v= \sqrt{8^2+2\times 9.81 \times 8.6}\\\\\rm v=15.03 \;m/sec

According to Newton's third equation of motion ;

\rm v=u-gt \\\\ \rm t=\frac{v-u}{g} \\\\ \rm t=\frac{15.03-8}{9.81} \\\\ \rm t=0.717 sec.

Hence the time would it take to reach the ground will be 0.717 sec.

To learn more about the velocity refer to the link ;

brainly.com/question/862972

3 0
3 years ago
Benny has 20 jellybeans and wants to share with his friends how many will each friend get? there are 5 friends.
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Answer each friend will get 3.33333 repeating if he is included. if only his friends are getting them then each one gets 4

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A 15-turn circular wire loop with a radius of 3.0 cm is initially in a uniform magnetic field with a strength of 0.5 T. The fiel
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To solve this problem it is necessary to apply the definition given in Faraday's law in a solenoid for which it is noted that

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