PHYSICS HIGH SCHOOL

What is average velocity of a particle?

Answers

Answer 1
Answer: Average velocity during a time interval is

       (the straight-line distance between the starting point and ending point,
         regardless of the route followed along the way)
divided by
       (the length of the time interval)
in the direction
       (from the starting point to the finishing point).
Answer 2
Answer: Avg. velocity = total Displacement / Total time taken
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PLEASE HELP, I NEED THIS ANSWERED!

Two students grab a slinky and start waving it up and down. A third student counts the number of waves that pass by every second and measures the distance between the wave peaks. This data is recorded and a graph is made to show the results.Determine the velocity of the wave produced.

A) 1 m/s

B) 2 m/s

C) 3 m/s

D) 6 m/s


Graph Attached*

Answers

Velocity = frequency * wavelength

v = fλ

Just pick any points on the graph for frequency f and corresponding λ

Taking the first red point at the top.

λ = 6m    f = 1 Hz

v = 6 * 1

v = 6 m/s

D. 

A boy throws a ball and accidentally breaks a window. The momentum of the ball and all the pieces of glass taken together after the collision is ________ the momentum of the ball before the collision

Answers

A boy throws a ball and accidentally breaks a window. The momentum of the ball and all the pieces of glass taken together after the collision is the same as the momentum of the ball before the collision. I think you forgot to give the choices along with the question. I hope that the answer has come to your great help.

A constant net torque is applied to a rotating object. Which of the following best describes the object's motion?a. The object will rotate with increasing angular acceleration.
b. The object will have a decreasing moment of inertia.
c. The object will rotate with constant angular velocity.
d. The object will have an increasing moment of inertia.
e. The object will rotate with decreasing angular acceleration.
f. The object will rotate with constant angular acceleration.

Answers

Answer:

f. The object will rotate with constant angular acceleration.

Explanation:

We know that

τ = I α

τ=Torque

I=Moment of inertia of the object

α =Angular acceleration

The moment of inertia is constant for an object and it does not depends on the applied torque.

If applied torque is constant then the angular acceleration of the object will be constant because moment of inertia is constant.

If angular speed is constant then the angular acceleration will,be zero.But in this case object is having angular acceleration that is why it have varying angular speed.

Therefore option "f" is correct.

Energy in the atom can be absorbed or released only in quanta of energy.

Answers

Released in quanta of energy

How can a cyclist minimize friction as he or she rides?A.by increasing the weight of the bike
B.by increasing the trend on his or her tires
C.by decreasing the air resistance
D.by decreasing aerodynamic design

Answers

The answer would be B. All the other answers would add friction.

The answer is C. by decreasing the air restistance. Hope this helps...

Help!!!!1. A material that can be hit without shattering is?
viscous, flammable, hard, malleable
2. At room temp., a substance with a melting point of 40% C is a?
solid, liquid, gas, mixture
3. what action involves a chemical change?
making ice cubes,adding sugar to tea, cutting wrapping paper, baking a cake
4.a substance that has a little tendency to change into other substance is said to have low?
reactivity, viscosity, density, conductivity
5. formation of a precipitate is usually evidence of?
the separation of a mixture, a chemical change, formation of a mixture, physical change

Answers

1. For the first one if it doesn't shatter then it is hard. 
2. We sould consider that room temperature is usually from 18°C (64°F) to 23°C (73°F) and since the melting point of the substance is 40˚C  the substance is liquid, because is melting point not an evaporation point it just melts from solid to liquid.
3. Well, in this one we have to consider that a chemical change it change the thing completely. So in this case is baking a cake because the products make the cake stop being them self and created something else.
4. It tends to have low reactivity. This is because viscosity means something like honey very sticky , density is how hard it is and lastly the conductivity I would believe is to pass electricity or current.
5. It is a physical change because the evaporated water transforms again into water and then fall as rain, snow or ice.
Hope it helped <3
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