If a ball with an original velocity of zero is dropped from a tall structure and it takes 7 seconds to hit the ground, what velocity does the ball have when it reaches the ground? A. 34.3 m/s B. 68.6 m/s C. 156.8 m/s D. 240.1 m/s

Answers

Answer 1

Answer: The velocity of the ball when it reaches the ground is equal to B. 68.6 m/s. This value was obtained from the formula Vf = Vi + at. Vf is the final velocity. Vi is the initial velocity. The acceleration is "a", while the time of travel is "t". The solution is:

Vf = Vi + at
Vf = 0 + (-9.8 m/s^2) (7 s)
Vf = -68.6 m/s

The negative sign denotes the direction of the ball.

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When a sound source is moving toward the observer, the observer will hear a higher pitch. This is due toa. a decrease in the amplitude of the sound wave.
b. a decrease in the frequency of the sound wave.
c. an increase in the frequency of the sound wave.
d. an increase in the amplitude of the sound wave.

Answers

number one a and b are automatically out if you decrease the pitch or frequency you wont hear it louder it does not add up ok?
number 2 the answer would be C the higher the frequency the higher the pitch the lower the frequency the lower the pitch this just comes back to common sense. for example you cant decrease the frequency and than expect a louder pitch its like saying I am going to smash the key on this piano with all my strength and it will make a small very low pitch sound you get what I mean so your answer would indeed be C.

What is air pressure?

Answers

Air Pressure is a force that is exerted onto your body by air molecules.

A current is always developed in the secondary of a transformer. true or false

Answers

false. only when supply 'alternate' current in the primary.

You step off of a ledge and land 0.5 seconds later. How high was the ledge?

Answers

1.25m

hope this is what you needed

1.25m

hope this is what u needed

A shot-putter throws an 8.00 kg shot at a speed of 10.0 m/s. What is the kinetic energy of the shot?

Answers

Answer:

Kinetic energy of the shot is 400 Joules

Explanation:

It is given that,

Mass of the shot, m = 8 kg

Speed of thrown, v = 10 m/s

We have to find the kinetic energy of the shot. It is given by the product of mass of an object and the square of velocity divided by 2 i.e.

$KE=(1)/(2)mv^2$

$KE=(1)/(2)* 8\ kg* (10\ m/s)^2$

KE = 400 Joules

Hence, the kinetic energy of the shot is 400 joules.

Ekin=1/2*m*v^2 so 1/2*8*(10m/s)^2 = 400Nm Or J

You're caring for three children in your home: a three-year-old, a four-year-old, and a two-month-old infant. The infant often becomes hungry and wants to be fed just when you're involved in something with the two older children. What should you do with the infant? A. Put the infant in a location so he or she can watch you and the other two children; then feed the infant when you're through.
B. Hold and feed the infant while you supervise the activity of the older children.
C. Have the older two children continue the project on their own while you feed the infant in a separate room.
D. Prop the infant's bottle in the crib so he or she can eat while you continue to help the older children

Answers

Answer: B. Hold and feed the infant while you supervise the activity of the older children.

Explanation: On one side, a two-month-old is too young to understand that he has to wait until you finish with your other activities so you are free to feed him. His needs are urgent. Of course he is also too young to take the bottle on his own. These are the reason why options A and D are incorrect. On the other side, the other two children also need your supervision. You have to take care of them and leave them alone is not a good option. This is why option C is incorrect. Taking all these things into account I find option B as the best answer.

B i belive, :) :) :) ..

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