PHYSICS HIGH SCHOOL

5,000 joules of thermal energy were applied to 1-kg aluminum bar. What was the temperature increase?

Answers

Answer 1
Answer:

Answer:

ΔT = 4.9°C

Explanation:

The thermal energy of the bar can be given as follows:

Thermal Energy = mCΔT

where,

m = mass of bar = 1 kg

C = specific heat capacity of aluminum = 1020 J/kg.°C

ΔT = Change in Temperature = ?

Therefore,

5000 J = (1 kg)(1020 J/kg.°C)ΔT

ΔT = (5000 J)/(1020 J/°C)

ΔT = 4.9°C

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In a series circuit, each circuit element has the same:a.currentc.capacitanceb.voltaged.resistance

Answers

In a series circuit, each circuit element has the same current. The answer is letter A. This is because the electrons flowing in a current has only a single path to follow. There are no other path that the current moves along.

When 10 N force applied at 30 degrees to the end of a 20 cm handle of a wrench, it was just able to loosen the nut. What magnitude of the force would require to just loosen the nut, if the force apply perpendicularly at the end of the handle

Answers

Answer:

5N

Explanation:

To get the magnitude of the force would require to just loosen the nut, if the force apply perpendicularly at the end of the handle, we will have to resolve the force perpendicular to the wrench. Torque is the turning effect of a body or force about a point. It is similar to moments.

Torque = Force * radius

Note that the force must be perpendicular to the wrench. On resolving the force perpendicularly to the wrench, we will have to resolve the force to the vertical.

Fy = Fsinθ

Fy = 10sin30°

Fy = 10 * 0.5

Fy = 5N

Torque = Fy * r

Given Fy = 5N and r = 20cm = 0.2m

Torque = 5 * 0.2

Torque = 1Nm

Hence the magnitude of the force would require to just loosen the nut, if the force apply perpendicularly at the end of the handle is 5N

You are given two solid materials one that is organic and one that is not organic. Describe three tests you could perform to help you decide which is which.

Answers

1- which one expires faster.
2- wbich one has more health benefits.
3- and which one tastes better which is the organic.

How does the direction of the change in velocity compared to the direction of the acceleration?

Answers


Technically, you can simply point out that "acceleration" MEANS
"change in velocity", so of course they have the SAME direction.
Actually, because acceleration is the derivative of velocity (or change of velocity at a certain point), the acceleration can be in a different direction than the velocity. If the velocity's magnitude is increasing away from zero, then the acceleration is in the same direction as velocity. If the velocity is getting closer and closer to zero (either from the negative or positive end of the number line) then the acceleration is in the opposite direction of velocity.
Think of it like a car. When you are slowing down to stop at a light, your velocity is still going forwards, but your acceleration is negative because it is decreasing the velocity. A negative acceleration is another way of saying that the acceleration is going in the opposite direction of the frame of reference.
If the car is speeding up, the velocity is forward, and the acceleration is in the same direction because the change of velocity is positive.
Hope this helped! :D

When air is blown across the top of an openwater bottle, air molecules in the bottle vibrate
at a particular frequency and sound is produced.
This phenomenon is called
(1) diffraction (3) resonance
(2) refraction (4) the Doppler effect

Answers

When air is blown across the top of an open water bottle, air molecules in the bottle vibrate at a particular frequency and sound is produced in a process called "refraction". 

Answer:

resonance

Explanation:

Resonance is when the frequency matches another objects natural frequency causing it to vibrate.

What is antoine lavoisier conservation of mass equation

Answers

Answer:

the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

Explanation:

The antoine lavoiser conservation of mass equation can be equal to the mass of the element
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