a student drops an object from the top of a building which is 19.6 m high. How long does it take the object to fall to the ground?

Answers

Answer 1

Answer:
Here's a formula that's simple and useful, and if you're really in
high school physics, I'd be surprised if you haven't see it before.
This one is so simple and useful that I'd suggest memorizing it,
so it's always in your toolbox.

This formula tells how far an object travels in how much time,
when it's accelerating:

   Distance = (1/2 acceleration) x (Time²).

   D = 1/2 A T²

For your student who dropped an object out of the window,

   Distance = 19.6 m
   Acceleration = gravity = 9.8 m/s²

D = 1/2 G T²

    19.6 =   4.9   T²

Divide each side by 4.9 :    4 =   T²

Square root each side:    2 =   T

When an object is dropped in Earth gravity,
it takes 2 seconds to fall the first 19.6 meters.

Answer 2

Answer: Earth's gravity is 9.807 m/s²

Using this we can divide 19.6/9.807 to get 1.999 seconds or two if you round.

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A 3.8 kg object to is lifted 12 meters. approximately how much work is performed during lifing? A) 45.6 J B)588 J C) 466.9J D) 372.4 J

Answers

You would do mass x distance which is 3.8 kg x 12m which equals A. 45.6 J.

What is the maximum temperature in a hot whirlpool to be considered safe?

Answers

Answer:

104 degrees

Never let the hot tub's water temperature get above 104 degrees Fahrenheit. For a healthy adult, a temperature of 100 degrees is regarded as safe. Young kids should use extra caution.

Why do stars have names

Answers

Astronomers give stars names so that they're able to identify and keep track of them more easily.

A subway train starts from rest at a station and accelerates uniformly at 1.8m/s^2 for 15 sec. then it runs at a constant speed for the next 35 sec. before decelerating at 2.0m/s^2 until it comes to rest at the next station. FIND THE DISTANCE between the stations and the AVERAGE SPEED of the train.(please show step by step and the formula that is used. Thank you!)

Answers

This looks so scary just because there are so many parts to it.
Take them one at a time:

First piece:
From rest, accelerates 1.8 m/s² for 15 sec.
Speed at the end of the 15 sec = 1.8 x 15 = 27 m/s
Distance covered = (average speed) x (time) = (13.5) x (15) = 202.5 meters

Middle piece:
Starts this piece at 27 m/s.
Runs at constant speed for 35 sec.
Covers (27 x 35) = 945 meters
Finishes this piece (15 + 35) = 50 seconds after leaving the first station
Finishes this piece (202.5 + 945) = 1147.5 meters from the first station.

Last piece:
Starts this piece 50 seconds after leaving the first station,
1147.5 meters from it, still moving at 27 m/s.
Decelerates at 2.0 m/s² .
--> It takes 27/2.0 = 13.5 seconds to come to a stop.
--> Distance covered during this piece = (average speed) x (time)
= (13.5 m/s) x (13.5 sec) = 182.25 meters
Finishes this piece (50 + 13.5) = 63.5 seconds after leaving the first station
Finishes this piece (1147.5 + 182.25) = 1,329.75 m from the first station

Distance between the stations (along the track) = 1,329.75 meters.

Average speed = (total distance) / (total time) = 1,329.75 / 63.5 = 20.941 m/s.

I sure hope I didn't make any stupid arithmetic blunders here,
because I really don't feel like going back and checking it.
Let me know, and I'll fix them.

A spring has a natural length of 20cm. If a 25-N force is required to keep it stretched to a length of 30 cm, how much work is required to stretch it from 20 cm to 25 cm?

Answers

First, we use Hooke's Law to calculate the spring constant, k:
F = kx
k = 25 / (0.3 - 0.2)
k = 250 N/m

Work = 1/2 kx²
W = 1/2 x 250 x (0.25 - 0.2)²
W = 0.3125 Joule

Which term best describes the change in frequency of waves when there is motion between the source of the waves and the observer?a. the Doppler effect
b. the Avogadro effect
c. the motor wave effect
d. the wave frequency effect

Answers

The Doppler effect is the term that best describes the change in frequency of waves when there is motion between the source of the waves and the observer. The correct option among all the options that are given in the question is the first option or option "a". I hope the answer helps you.

Answer:

Explanation:

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