1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
dybincka [34]
4 years ago
9

A girl on a bridge throws a rock

Physics
1 answer:
Anon25 [30]4 years ago
6 0

t = 1.3 s.

To solve this exercise we have to use the freefall equation t = (v-v₀)/g. v = 0 due the final velocity when the rock reach the ground is 0.

With v₀ = -12.5m/s and g = 9.8m/s²

t = -(-12.5m/s)/9.8m/s²

t = 1.3 s

You might be interested in
A 1.0-kilogram object moving east with a velocity of 10 meters per second collides with a 0.50-kilogram object that is at rest.
NeTakaya

Answer:

10kg m/s

Explanation:

We can use the conversation of momentum for this question. Essentially the momentum before and after the crash will remain the same. We can use the formula P = mv to solve.

P = 1 * 10

P = 10kg m/s

Best of Luck!

3 0
3 years ago
What is the relationship between air pressure and wind velocity
iVinArrow [24]
Air pressure is proportional to the square of the wind velocity.

Wind speed is how fast wind goes and atmospheric pressure is the pressure that the atmosphere pushes on us. The greater the difference in barometric pressure from a high pressure zone to a low pressure zone, the greater the wind velocity will be.

Hope this helped!
4 0
3 years ago
An electric charge, A, is placed carefully between two other charges, B and C, and experiences no net electric force. Do B
Brrunno [24]

Answer:

I do not have  enough information to tell

Explanation:

This is deduced due to the fact that if the net force due to B and C on A is zero, the charges on B and C could either be positive or negative depending on the charge on A.

5 0
3 years ago
The food calorie, equal to 4186 J, is a measure of how much energy is released when food is metabolized by the body. A certain b
rewona [7]

Answer:

The hiker has to climb 941.26 to ''work off'' the calories.

Explanation:

Let's first find out how much energy the hiker gets from 150 food calories.

This is:

Energy = 150 * 4186

Energy = 627.9 kJ

To burn all of this off, we set it equal to the gravitational potential energy, and then solve for the height.

This is:

Gravitational Potential Energy (G.P.E) = 629700

G.P.E = mass * gravity * height

Thus,

mass * gravity * height = 629700

68 * 9.81 * height = 629700

height = 941.26 meters

5 0
3 years ago
A machine that changes only the direction of a force has a mechanical advantage of
8090 [49]

Answer:

1

Explanation:

The word "only"= one!

5 0
3 years ago
Read 2 more answers
Other questions:
  • Paul is driving his car on a sunny afternoon. Which glasses should he ideally wear while driving
    7·2 answers
  • The velocity of the wave involved in the Doppler effect:
    11·2 answers
  • A wave is propagating from left to right in a medium. The particles in the medium are also vibrating from left to right. What ki
    5·1 answer
  • True or false. electrons move in orbits in the same way plants orbit the sun
    15·2 answers
  • Gaya 7,5 dikerjakan pada masa sebesar 3 kg sehingga kelajuannya berubah dari 65 cm/s menjadi 15 m/s maka waktu yang dibutuhkan a
    13·1 answer
  • A spelunker is surveying a cave. She follows a passage 180 m straight west, then 290 m in a direction 45∘ east of south, and the
    6·1 answer
  • When two atoms approach each other the electron of each are attracted to the protons of the other. This is known as
    7·1 answer
  • School PlanSchool Plannerner
    9·2 answers
  • How many neutrons are in He
    14·1 answer
  • Can i use a 1000mAh battery instead of 600mAh Battery?<br>please tell me quickly
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!