PHYSICS HIGH SCHOOL

On the Celsius scale, one degree indicates the same temperature change as A. one degree Fahrenheit.
B. 5/9 degree Fahrenheit.
C. one kelvin.
D. 9/5 kelvin.

Answers

Answer 1
Answer: Choice  ' C '  is the only correct one.

The Celsius degree and the Kelvin are also the
same size as 9/5 (1.8) Fahrenheit degrees.
Answer 2
Answer: D)   9/5 kelvin is WRONG 

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Another machine uses an input of 200 newtons to produce an output force of 80 newtons what is the mechanical advantage of this machine
True or false? Cells in the retina are photo-sensitive.
you toss a bowling ball straight up into the air with a speed of 2.1. how long does it take the bowling ball to reach its highest point?
Why is it important for scientists to measure how much precipitation is falling across the world?
A speeder passes a parked police car at a constant speed of 23.3 m/s. At that instant, the police car starts from rest with a uniform acceleration of 2.75 m/s 2 . How much time passes before the speeder is overtaken by the police car? Answer in units of s.

Potential and kinetic energy 1. An apple falling from a tree
2. A stationary ball on the ground
3. A sleeping dog
4. A boy running across the street
5. A car traveling on the road
6. A stretched rubber band
7. A basketball being thrown
8. A girl biking at the park
9. A leaf lying on the ground
10. A planet revolving around a star

Answers

Here's how potential and kinetic energy relate to the scenarios you've mentioned:

1. An apple falling from a tree: Kinetic energy increases as it falls, while potential energy decreases.

2. A stationary ball on the ground: No kinetic energy (it's not moving), but it has potential energy due to its position above the ground.

3. A sleeping dog: The dog has potential energy due to its position above the ground, but it's not in motion, so there's no significant kinetic energy.

4. A boy running across the street: The boy has both kinetic and potential energy. His motion represents kinetic energy, and his position above the ground while running represents potential energy.

5. A car traveling on the road: The car has both kinetic energy (due to its motion) and potential energy (due to its position above the road).

6. A stretched rubber band: The stretched rubber band has potential energy stored in its stretched configuration.

7. A basketball being thrown: The basketball has both kinetic energy (while it's in motion) and potential energy (when it's at the highest point of its trajectory).

8. A girl biking at the park: Similar to the boy running, the girl on the bike has both kinetic and potential energy.

9. A leaf lying on the ground: The leaf has potential energy due to its position above the ground, but it has little to no kinetic energy unless it's moving in the wind.

10. A planet revolving around a star: The planet has both kinetic energy (due to its orbital motion) and potential energy (related to its position within the gravitational field of the star).

In general, potential energy is associated with an object's position or state, while kinetic energy is associated with its motion.

When a pot of water is put on a stove, the water at the top gets hot primarily by ____.a. radiation
c. convection
b. conduction
d. condensation

Certain materials can become superconductors under what conditions?
a. When it is very hot
c. Under very high pressure
b. When it is very cold
d. Under very low pressure

Answers

Answer
1. c. convection
2. b. When it is very cold

Explanation
Water like any other liquid transfer heat energy through convection. 

When a pot of water is put on a stove, the water at the top gets hot primarily by convection.

A supperconductor is a material that can conduct electric current with no resistance at all. 
The supperconductivity can be achieved under cooled temperatures. 

Certain materials can become superconductors under what conditions? When it is very cold

The first one is C. convection

The mass of a stroller and the child it carries is 23.7 kg. A man pushes the stroller with a force of 142 N at an angle of 38.0° to the vertical. The stroller experiences a friction force of 24.0 N due to the brake accidentally being on. What is the stroller's acceleration forward?A. 5.99 m/s2
B. 3.90 m/s2
C. 2.68 m/s2
D. 4.98 m/s2

Answers

the horizontal resultant force applied is 142*Cos(38) which is 135.62N

24N of opposing force
therefore the total force acting on the stroller is 135.62-24=111.62N

applying the formula f=ma
where f is force
m= mass
a= acceleration
plugging the values we get the stroller's acceleration forward as 3.90 m/s^2

A solution is known as a homogeneous mixture because _[blank]_.the solvent particles are uniformly dissolved in the mixture
the solvent fully dissolves in the solute
the solvent is always water
the solute fully dissolves in the solvent

Answers

Answer:

The solute fully dissolves in the solvent

Explanation:

This is because for a solution to be called a homogeneous mixture, all the solute must be dissolved in the solvent, without the particles of the solute being visible in the solvent.

Consider two walls, A and B, with the same surface areas and the same temperature drops across their thicknesses. The ratio of their thermal conductivities is kA/kB=4 and the ratio of the wall thickness is LA/LB=2. The ratio of heat transfer rates through the walls qA/qB is:(a) 0.5

(b) 1

(c) 2

(d) 4

(e) 8

(f) None of them

Answers

Answer:

(c) 2

Explanation:

Heat transfer across the walls due to conduction is given by:

q = -KA(\Delta T)/(L)

where,

q = heat transfer rate

K = thermal conductivity

A = Area

ΔT = change in temperature

L = thickness

For wall A:

q_A = -K_AA(\Delta T)/(L_A)

For wall B:

q_B = -K_BA(\Delta T)/(L_B)

Because the change of temperature and area of walls are the same. Dividing both terms:

(q_A)/(q_B) = ((K_A)/(L_A) )/((K_B)/(L_B))\n\n (q_A)/(q_B) =((K_A)/(K_B) )/((L_A)/(L_B))

using values given in the question:

(q_A)/(q_B) = (4)/(2)\n\n(q_A)/(q_B) = 2

Therefore, the correct answer is:

(c) 2

A ball is thrown upward at a velocity of 20m/s. What is the velocity after 3 seconds?

Answers


This is a perfect problem to use positive and negative velocities.

Let's call the positive direction the direction that points UP. 
Then the negative direction is the one that points down.

The acceleration of gravity on Earth is 9.8 m/s² down.  That means
that any object with no forces on it except gravity gains 9.8 m/s of
speed downward every second.

OK. Ready to go to work:

The ball's initial velocity is +(up)20.0 m/s .
Every second after the toss, the ball has -(down)9.8 m/s more velocity.

The ball's velocity after 3 seconds is

            +20 + 3(-9.8)  = 

              20  -  29.4  =    - 9.4 m/s .

That means it's velocity at that time is  9.4 m/s pointing down.

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