PHYSICS HIGH SCHOOL

In the equation for Ohm’s law what does I stand for?A. current

B. resistance

C. kilowatts

D. voltage

Answers

Answer 1
Answer: A) current 

(I is always current in electricity)

Related Questions

The psychologist who worked with Peter and helped him associate rabbits with positive things was: a. Mary Covert-Jones b. Ivan Pavlov c. Elizabeth Loftus d. John Watson Knowing the formula for water and table salt is an example of:_________________memory. a. episodic b. procedural c. semantic d. echoic The part of the brain that appears to be involved in the processing of short-term memories into long term is the: a. hypothalamus b. hippocampus c. corpus callosum d. cerebrum
Name three elements that are good conductors of electricity
Which concept represents most encompassing aspect of our lives
A fast car (Car A) and a slow car (Car B) both travel the same distance. Which car takes more time to do this? Explain.
.In real life, a given system can approach equilibrium from different starting points but will still have the same equilibrium constant. How is this possible? Explain your answer in complete sentences.

A ball thrown vertically upward reaches a certain height and comes down again. What can you say about its kinetic energy at the maximum height?

Answers

Answer: The kinetic energy of the ball at the maximum height is zero.

Explanation -

As per the question, the ball is moving vertically upwards. Every time it's velocity will decrease and it becomes zero at the maximum height.


Whole of ball's initial kinetic energy is converted into potential energy at maximum height.


Thus we can conclude that the kinetic energy is zero at the maximum height.

The maximum height is the point where the ball runs out of gas,
stops rising, starts falling, and it's velocity changes from upward
to downward.  At that instant, it has no speed, so its kinetic energy
is zero.

A plane is flying due east at 520 mile/hour. Another plane is 20 miles east of that plane, flying with a velocity of 650 miles/hour due west what is their relative velocity

Answers

i dont know, sorry! plane is flying due east at 520 mile/hour. Another plane is 20 miles east of that plane, flying with a velocity of 650 miles/hour due west what is their relative velocity

In a physics experiment, two equal-mass carts roll towards each other on a level, low-friction track. One cart rolls rightward at 2 m/s and the other cart rolls leftward at 1 m/s. After the carts collide, they couple (attach together) and roll together with a speed of __________. Ignore resistive forces.a. 0.5 m/sb. 0.33 m/s
c. 0.67 m/s
d. 1.0 m/s
e. none of these

Answers

Answer:

The correct answer is option a.

Explanation:

Conservation of momentum :

m_1u_1+m_2u_2=m_1v_1+m_1v_2

Where :

m_1, m_2 = masses of object collided

u_1,u_2 = initial velocity before collision

v_1,v_2 = final velocity after collision

We have :

Two equal-mass carts roll towards each other.

m_1=m_2=M

Initial velocity of m_1=u_1=2 m/s

Initial velocity of m_2=u_2=-1 m/s (opposite direction)

Final velocity of m_1=v_1=v (same direction )

Final velocity of m_2=v_2=v  (same direction)

M* 2 m/s+M(-1 m/s)=Mv+Mv

1 m/s=2v

v = 0.5 m/s

rg135

The speed of the carts after their collision is 0.5 m/s.

A current of 120 mA flows past a point in a circuit for 25 s. How much charge passes the point in this time?
How many electrons pass the point in this time?

Answers

a) I = 120 mA = 120 x 10^(-3) A = 0.12
A = 0.12 C/s ... [b/c 1 A = 1 C/s]
t = 25 s
I = Q/t
Q = It
Q = 0.12 * 25 = 3 C
so 3C of charge passes the point during the
25 s interval

[URGENT] A swimmer wants to end up at a dock due north of her starting position on the south shore of a river. In still water her maximum speed is 1.25m/s. The river has a current flowing 0.35m/s [E].a.) calculate the direction that she must aim herself through the water to arrive at the dock.

b.) how long will it take for the swimmer to cross the river, if the distance from the starting point to the dock is 300 m?

Please show all your work, thanks

Answers

a)The direction that she must aim herself through the water to arrive at the dock will be 73.7°.

b)The time it takes for the swimmer to cross the river will be 240 seconds.

What is speed?

Speed is defined as the rate of change of the distance or the height attained. it is a time-based quantity. it is denoted by u for the initial speed while v for the final speed. its si unit is m/sec.

Given data;

The maximum speed of the swimmer In still water,v=1.25m/s.

Speed of river = 0.35m/s [E]

α is the direction that she must aim herself through the water to arrive at the dock.

t is the time it takes for the swimmer to cross the river

The distance from the starting point to the dock is,s = 300 m

If the swimmer were to swim straight, the water's speed along the x-axis would have to match that of the swimmer.

\rm v_w = v_x = 0.35 \ m/sec

α is the angle between vx and v

The value of the

\rm cos \alpha = (v_x)/(v) \n\n \alpha = cos ^(-1)((0.35)/(1.25) )\n\n \alpha = 73.7 ^0

The time that the swimmer will use for reaching the dock;

s = V×t

t = s/(v)

t=300 m / 1.25 m/sec

t = 240 seconds

Hence, the direction that she must aim herself through the water to arrive at the dock. and it takes for the swimmer to cross the river will be 73.7° and 240 seconds respectively.

To learn more about the speed refer to the link;

brainly.com/question/7359669

#SPJ2

Explanation:

As you can see in the picture, we want the swimmer to go on a straight line, so the speed of the water must be equal to the speed of the swimmer along the x-axis. We also know the value of v, so we can calculate the of the cosine of the angle (alpha) between Vx and V. Thanks to the fundamental relation of gioniometry (cos^2(x) + sin^2(x) = 1) we can find the sine of alpha and calculate Vy. With Vy we can calculate the time that the swimmer will use for reaching the dock: s = Vy * t => t = s/(Vy).

I'll let you do all the calculations, you just have to plug in values.

Which of the following best explains the importance of water to humans?a.Water is essential for sustaining human life.
b.Water is important for shipping and trade.
c.Water is a valuable, profitable commodity.
d.All of the above

Answers

Answer;

-All of the above

  • Water is essential for sustaining human life.
  • Water is important for shipping and trade.
  • Water is a valuable, profitable commodity.

Explanation;

-Water is one of the most important substances on earth. All plants and animals must have water to survive. If there was no water there would be no life on earth. Apart from drinking it to survive, people have many other uses for water such as cooking, washing clothes, cleaning, recreation, etc.

-Water is also essential for the healthy growth of farm crops and farm stock and is used in the manufacture of many products. Water is also important in our bodies; It facilitates digestion of food and absorption of nutrients through their dissolving in water, transports nutrients, chemicals and heat throughout the body. Water is our primary source of food.
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