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
Arturiano [62]
3 years ago
6

A rock is thrown off a cliff with a horizontal velocity of 18.3 m/s. Right before it hits the ground, it has a vertical velocity

of -31.3 m/s. What is the magnitude of the rock's overall velocity?
Physics
1 answer:
AleksAgata [21]3 years ago
5 0

Answer: 36.257 m/s

Explanation:

The vertical and horizontal components of a projectiles motion are completely independent of each other. The only thing they share is the amount of time in the air. Because they are independent, the acceleration of gravity cannot affect the horizontal acceleration. This means horizontal acceleration is 0. If the acceleration is 0, this means the velocity does not change horizontally. So the final velocity of the x component is equal to the initial.

Now if you actually imagine these two vectors, it forms a right triangle. So you can use the Pythagorean Theorem to find the resultant vector.

a^2+b^2=c^2\\18.3^2+(-31.3)^2 = c^2\\c = 36.257 m/s

You might be interested in
What happens when the elevator is in free-fall, that is, what is the value for FN and what is the sensation experienced by the p
Komok [63]

Answer:

Weightlessness

Explanation:

When the elevator is in free fall, this can only occur when the cord of the elevator breaks.

The acceleration of the elevator will be equal to the acceleration due to gravity. That is:

a = g

Then, the body will experience what we called WEIGHTLESSNESS

Where the normal reaction N of the person will tend to zero. That is

N = 0

The value of FN < 0 because the person inside the lift will experience weightlessness.

7 0
3 years ago
An airplane is flying through a thundercloud at a height of 2000 m (This is a very dangerous thing to do because of updrafts, tu
Doss [256]

Answer:

400000\ \text{N/C}

Explanation:

q_1 = Charge at 3000 m = 40 C

q_2 = Charge at 1000 m = -40 C

r_1 = 3000 m

r_2 = 1000 m

k = Coulomb constant = 9\times10^9\ \text{Nm}^2/\text{C}^2

Electric field due to the charge at 3000 m

E_1=\dfrac{k|q_1|}{r_1^2}\\\Rightarrow E_1=\dfrac{9\times 10^9\times 40}{3000^2}\\\Rightarrow E_1=40000\ \text{N/C}

Electric field due to the charge at 1000 m

E_2=\dfrac{k|q_2|}{r_2^2}\\\Rightarrow E_2=\dfrac{9\times 10^9\times 40}{1000^2}\\\Rightarrow E_2=360000\ \text{N/C}

Electric field at the aircraft is E_1+E_2=40000+360000=400000\ \text{N/C}.

7 0
3 years ago
Energy can do blank or bring about change
Mrac [35]

Work

Explanation:

Energy can do work or bring about change.

Energy is simply the ability to do work. When work is done, changes occur in a body.

  • There are different forms of energy and they are all related to work done.
  • When work is done on a body, a force causes a change in that body.
  • Both potential and kinetic energy are the same as work done.
  • Energy is needed to do work.
  • Work is done when a body changes energy.

Learn more:

Energy brainly.com/question/5416146

#learnwithBrainly

4 0
3 years ago
Which group on the periodic table would form componds with group 2
Lina20 [59]

Answer:

The elements in group 2  form compounds consisting of one atom of the element and two atoms of hydrogen: These are called alkaline earth metals, with similar properties among members of that group.

Explanation:

4 0
3 years ago
Read 2 more answers
A 3000 kg deck is cantilevered over a beam as shown. It is attached to the house at the other end. Find the force of the beam.
Afina-wow [57]
The beam is acting as the pivot and the weight of the deck acts through its center its gravity, at the midpoint of the deck. 
Center of gravity at: (16 + 4)/2 = 10 ft

Converting 4 ft to meters: 1.22 m
Converting 10 ft to meters: 3.05

F x 1.22 = 3.05 x 3000 x 9.81
F = 73,600 N
4 0
3 years ago
Other questions:
  • Most often frequency is measured by the number of waves that pass a point in one blank
    11·1 answer
  • a 6-kg and a 4-kg ball are acted on by forces of equal size. if the large ball accelerates at 2 m/s2 what acceleration will the
    9·2 answers
  • A tortoise and a hare engage in a race. A tortoise can run with a speed of 0.15 m/s. A hare can run 25 times as fast as the tort
    10·2 answers
  • A rocket of initial mass 115 kg (including all the contents) has an engine that produces a constant vertical force (the thrust)
    13·1 answer
  • Which renewable resource could become a nonrenewable resource if used faster than Earth's ability to replenish its supply? A. wa
    15·2 answers
  • ____________ interference occurs when two waves are out of phase
    12·1 answer
  • The displacement ‘s' of a point moving in a straight line is given by: s = 6t^2 + 5t – 5, ‘s' being in cm and ‘t' in s. The init
    11·1 answer
  • A 0.155 kg arrow is shot upward
    11·2 answers
  • An empty container has a mass of 3 g. When it is filled with 5 cm3 of a liquid,
    9·1 answer
  • What is the order of magnitude of the distance of Sun to nearest star in meters?
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!