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
Paladinen [302]
3 years ago
14

. A child drops a ball from a window. The ball strikes the ground in 3.0 seconds. What is the. A child drops a ball from a windo

w. The ball strikes the ground in 3.0 seconds. What is the
velocity of the ball the instant before it hits the ground?
Physics
1 answer:
Vsevolod [243]3 years ago
3 0

Answer:

30m/s

Explanation:

  • Use formula for height calculation: Time = √2h/√g
  • From here calculate height which comes out to be: 45m(if g is taken 10)
  • Then use formula for velocity calculation: v = √2gh

  • The velocity comes out to be 30m/s

You might be interested in
Takumi works in his yard for 45 minutes each Saturday. He works in the morning, and he wears sunscreen and a hat each time he wo
MrRa [10]

Explanation :

Takumi wears sunscreen and a hat each time he works in the yard. This is to protect himself with the strong radiation coming from the sun. UV rays that are coming from the sun are the main cause of skin cancer.

Stochastic effects are the effects that are caused by chance. Cancer is one of the main stochastic effects.

So, the correct option is (b) "the severity of stochastic effects, such as cancer".

7 0
3 years ago
Read 2 more answers
At which position is the LOWEST potential energy?
Ad libitum [116K]
The answer is position 3, because it is at its lowest point.

Potential Energy is “stored energy.” It is energy that is ready to be converted or released as another type of energy. We most often think of potential energy as gravitational potential energy. When objects are higher up, they are ready to fall back down. When you stretch an object and it has a tendency to return to its original shape, it is said to have elastic potential energy. Chemical potential energy is the stored energy in a substance’s chemical structure that can be released in a chemical reaction or as heat.

7 0
3 years ago
Which test was conducted on the skin found under the victim’s nails?
BARSIC [14]
Y-STR analysis. It is a DNA test used to compute and match with the possibility via lap.
5 0
3 years ago
Read 2 more answers
50 POINTS !!!
shepuryov [24]

Answer:

a) I = 464 kg m²,  b)  K = 631 .6 J, c)  v = 8.25 m / s

Explanation:

a) the moment of inertia of point particles is

          I = ∑ m_i r_i²

in this case

          I = 8 5² + 3 (-2) ² + 7 (-6) ²

          I = 464 kg m²

b) The kinetic energy is

          K = ½ I w²

          K = ½ 464 1.65²

          K = 631 .6 J

c) linear and angular velocity are related

          v = w r

          v = 1.65 5

          v = 8.25 m / s

8 0
2 years ago
Two identical charges are separated by a distance d. If the distance between them is increased to 3d, what will happen to the fo
belka [17]
A-It will be one-ninth the original force
3 0
3 years ago
Read 2 more answers
Other questions:
  • A traditional set of cycling rollers has two identical, parallel cylinders in the rear of the device that the rear tire of the b
    9·1 answer
  • Ok, so I've answered this question but I really need someone to just check through it because I have this feeling that I've done
    10·2 answers
  • The Bay of Fundy has the greatest tidal ranges on Earth. What can you infer about the Bay of Fundy?
    7·1 answer
  • According to Newton’s second law of motion, force equals mass times acceleration (F = ma). Given that a car has a mass of 3,000
    9·1 answer
  • I am so confused please help
    7·1 answer
  • You are on an airplane traveling with a constant velocity at an altitude of 20,000m. What is the acceleration of gravity at that
    15·2 answers
  • Lisa made the electromagnet shown. A nail with wire coiled around it has its head labeled S to the right and its point labeled N
    13·2 answers
  • What is the concentration of H^ + at apH = 2 ? Mol / L What is the concentration of H^ + ions at apH = 6 ? Mol/L How many more H
    5·1 answer
  • A person pushes an object of mass 5.0 kg along the floor by applying a
    8·1 answer
  • Which action would a chemist most likely take to determine how the
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!