PHYSICS HIGH SCHOOL

I WILL GIVE BRAINLIEST Which two measurements are needed to calculate the velocity of an object?
A. Displacement
O B. Time
C. Acceleration
D. Average speed

Answers

Answer 1
Answer:

Final answer:

To calculate velocity in Physics, the two necessary measurements are displacement and time. Velocity is the speed in a specified direction, determined by dividing displacement by time.

Explanation:

In the field of Physics, the two measurements needed to calculate the velocity of an object are displacement and time. Velocity refers to the speed in a given direction and is calculated by dividing displacement (which gives direction information and distance) by the time it takes to move that distance. For example, if an object traveled 100 meters to the north in 20 seconds, the velocity would be 5 meters per second towards the north.

Learn more about Velocity here:

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Answer 2
Answer:

Answer:

A. Displacement

B. Time

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What happens to an earthquake's S-waves when they strike the core?A) They bounce off
B) They are absorbed
C) The change into P-waves
D) They change into L-waves

Answers

Answer:

B) They are absorbed

Explanation:

B is correct because S waves can only travel through solid materials.  When they hit liquid materials they are absorbed in and undetectable.

Answer:

B) They are absorbed

Explanation:

When they hit the liquid core, S-waves are no longer able to be detected. While P-waves bounce off the liquid core, S-waves are absorbed at the core.

stone thrown vertically upward with speed of 15.5m/s from edge of cliff 75.0m high. how much later does it reach bottom of cliff?

Answers

Answer:

Approximately 5.66\; {\rm s}, assuming that g = 9.81\; {\rm m\cdot s^(-2)} and that air resistance is negligible.

Explanation:

Let upward be the positive direction. Under the assumptions, acceleration of the stone would be a = (-g) = (-9.81)\; {\rm m\cdot s^(-2)} (negative since the stone is accelerating downward.)

The duration of the flight can be found in the following steps:

  • Find velocity right before landing given displacement, initial velocity, and acceleration.
  • Find duration of the flight from acceleration and the change in velocity.

In SUVAT equation v^(2) - u^(2) = 2\, a\, x:

  • v is the final velocity right before landing (needs to be found,)
  • u = 15.5\; {\rm m\cdot s^(-1)} is the initial velocity,
  • a = (-9.81)\; {\rm m\cdot s^(-2)} is acceleration, and
  • x = (-75.0)\; {\rm m} is displacement (downward because the stone landed below where it was launched.)

Rearrange this equation to find v:

\begin{aligned}v &= \sqrt{u^(2) + 2\, a\, x} \n &= \sqrt{(15.5)^(2) + 2\, (-9.81)\, (-75.0)} \; {\rm m\cdot s^(-1)} \n &\approx -40.05\; {\rm m\cdot s^(-1)}\end{aligned}.

In other words, the velocity of this stone has changed from the initial value of u = (15.5)\; {\rm m\cdot s^(-1)} to v \approx (-40.05)\; {\rm m\cdot s^(-1)} during the flight. Divide the change in velocity by acceleration a = (-9.81)\; {\rm m\cdot s^(-2)} (the rate of change in velocity) to find the duration of the flight:

\begin{aligned}t &= (v - u)/(a) \n &\approx ((-40.05) - (15.5))/((-9.81))\; {\rm s} \n &\approx 5.66\; {\rm s}\end{aligned}.

In other words, the stone would be in the air for approximately 5.66\; {\rm s}.

What is the molar mass, in grams, of a mole of an element equal to?A. The number of electrons
B. The atomic weight of the element
C. The atomic number of the element
D. The number of neutrons in the element

Answers

Answer : Molar mass is equal to the atomic weight of the element.

Explanation :

The ratio of the mass of a given substance to the amount of substance is called as the molar mass of that substance. It is denoted by M. Its SI unit is kg/mol but it is usually expressed in g/mol.

In simpler form it is equal to the atomic weight of the substance.

For example, the molar mass of water can be calculated as :

M=2* 1+2(8)=18\ g/mol

Hence, the correct option is (B) "The atomic weight of the element".

The correct answer is B. The atomic weight of the element 

Where does the material for new mountain ranges come from

Answers

In the formation of mountain ranges and all other landforms, there is always a cycle involved. As one mountain comes up, another land gets pushed down into the hot mantle, where the rock will melt. Due to convection currents, the tectonic plates move and their boundaries cause them to interact with each other. As mountain ranges are formed, other land gets pushed up forming what we know are mountains, with rising magma from other parts of the world solidifying creating new rock to fill the empty space.

Chọn phát biểu đúng. Trong công thức của chuyển động thẳng nhanh dần đều: A. v luôn luôn dương. B. a luôn dương.
C. a luôn cùng dấu với v. D. a luôn ngược dấu với v.

Answers

Answer:

B.

Explanation:

If you hit another object with your vehicle, your _______ will be slowed or stopped by the force of impact caused by that object upon impact.

Answers

Answer:

Speed

Explanation:

If a vehicle hit any other object then its speed will slow down or some time the vehicle will stop its depends on the force exerted by other object on the vehicle.

The change in speed of vehicle is due to momentum because momentum is always conserved. So to conserve the momentum the speed of the vehicle decreases because after hitting the overall mass is increases.

Answer:

Vehicle

Explanation:

This is referring to mechanism that heat the object.
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