PHYSICS HIGH SCHOOL

What is the kinetic energy of an object that has a mass of 30kg and moves with a velocity of 20 m/s?A. 6,000J
B. 12,000J
C. 5,880J
D. 2,940J

Answers

Answer 1
Answer: a) 6000J

the formula will fit in, once you know the formula you are good to answer. 
k.e.=1/2 mv^2 

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A machine uses a force of 200 newtons to do 20,000 joules of work in 20 seconds. Find the distance the object moved and the power of the machine.

Not sure if this is a physics question but how do I find the formula using
ohms law..any one

Answers


Physics is as good a place as any, I guess.

And, before we roll up our sleeves, may I also note that assigning 48 fill-ins
(4 each for 12 problems) is exceeded in its excess only by expecting all of
the answers in return for 5 points.    I'll give you the tips and hints you need
in order to solve these, and then I'll wish you well.

I see from the label in the upper corner that all of this refers to series circuits.
That's important to know, and I was about to ask.  So we're going to assume
that for the whole bunch on the page, R1 and R2 are in series, connected
across VS, and there are no other components involved besides the two
resistors.

OK.  Here are the tools you need:

On a resistor . . .
                             ' K ' = 'thousand'
                         ' Meg ' = 'million'

Total resistance . . . RT = R1 + R2 ohms

Voltage across each resistor:
                                                  VR1 = VS  [ R1 / (R1+R2) ]    volts

                                                  VR2 = VS [ R2 / (R1+R2) ]     volts

Total current in the series circuit:   
                                                   IT = VS / RT  = VS / (R1+R2)  Amps

And that's it. Easier than I thought.  There are some other things that
it could have asked for, but it didn't.

Example: 
Line #4:
VS = 5 volts
R1 = 470 ohms
R2 = 1,000 ohms

RT = R1 + R2 = 1,470 ohms

VR1 = VS ( R1/RT ) = 5 (470 / 1,470) = 1.598... volts
VR2 = VS ( R2/RT ) = 5 (1,000 / 1,470) = 3.401 volts

(Notice that  VR1 + VR2 always = VS.)

IT = VS / RT = 5 / 1,470 = 0.0034 Amperes = 3.4 mA (milliamps)

The power supplied by the battery is  (VS)²/RT = 0.017 watt ,
but it doesn't ask for that.

And that's it !  That's everything you need.  Go get 'em, champ !

How long does it take an airplane to fly 5000 miles if it maintains a speed of 240 miles per hour

Answers

With a 30 mph head wind it takes the plane 18.52 hours to fly 5000 miles. ANSWER 2: With a 30 mph tail wind it takes the plane 15.15 hours to fly 5000 miles.

Most earthquakes are produced by the rapid release of which kind of energy stored in rock subjected to great forces?a. kinetic
b. thermal
c. elastic
d. mechanica

Answers

The correct answer for the question that is being presented above is this one: "c. elastic." Most earthquakes are produced by the rapid release of 
elastic energy stored in rocks subjected to great forces. The greater the elasticity of the energy, the more it is subjected to great forces.

How do the units of work and power compare? a) The unit for work is a watt. The unit for power is a joule, which is a watt-second. b)The unit for work is a watt. The unit for power is a joule, which is a watt per second. c)The unit for work is a joule. The unit for power is a watt, which is a joule-second.
d)The unit for work is a joule. The unit for power is a watt, which is a joule per second.

Answers

Answer:

Option (d) is correct.

Explanation:

Work done is given by :

W = Fd, where F is force and d is displacement

Unit of work done :

The SI unit of force is Newton (N) and that of displacement is meter (m). So, the unit of work done is N-m. It is call Joule. It means that the unit of work done is Joule.

Power is given by rate at which the work is done. It is given by :

P = W/t, W is work done and t is time

Unit of power:

Unit of work is Joule (J) and that of time is second (s). It means that the unit of power is Watt and it is equal to Joule/second

Hence, the correct option is (d) "The unit for work is a joule. The unit for power is a watt, which is a joule per second".

Answer: The unit for work is a joule. The unit for power is a watt, which is a joule per second.

Explanation:

IN a physics lab, a student discovers that the magnitude of the magnetic field at a certain distance from a long wire is 4.0μT. If the wire carries a current of 5.0 A, what is the distance of the magnetic field from the wire?

Answers

Answer:

0.25 m

Explanation:

The intensity of the magnetic field around a current-carrying wire is given by:

B=(\mu_0 I)/(2 \pi r)

where

where

\mu_0 = 4\pi \cdot 10^(-7)Tm/A is the permeabilty of free space

I is the current

r is the distance from the wire

In this problem, we know:

B=4 \mu T=4 \cdot 10^(-6) T is the magnetic field

I=5.0 A is the current in the wire

Re-arranging the equation, we can find the distance of the field from the wire:

r=(\mu_0 I)/(2 \pi B)=((4\pi \cdot 10^(-7))(5.0 A))/(2\pi(4\cdot 10^(-6) T))=0.25 m

When the temperature of water increases from room temperature to 90ºC the process of heating the water is... Question 9 options: A. adiabatic
B. exothermic
C. isothermic
D. endothermic
E. all of the above

Answers

Answer : The correct option is, (D) Endothermic

Explanation :

Adiabatic : It is a process in which a heat is constant. That means no heat is lost or gained by the system.

Isothermic : It is a process in which a temperature is constant.

Exothermic : It is a process in which heat released from system to surrounding. In this process, surrounding temperature increases and system temperature decreases.

Endothermic : It is a process in which heat required from the surrounding. In this process, surrounding temperature decreases and system temperature increases.

When the temperature of water increases from room temperature to 90ºC the process of heating the water is endothermic.

Hence, the correct option is, (D) Endothermic

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