PHYSICS HIGH SCHOOL

Which literal equations are equivalent to w = Fd? Choose all answers that are correct.A. d = fw
B. d = wf
C. f = wd
D. f = dw

Answers

Answer 1
Answer: None of the given choices would be equivalent to the equation w = F x d. If I am given the freedom to give equivalent expressions for the given equation those would be, 
                                   w / d = F or w / F = d
If we multiply the denominator of the left hand side of the equation to the term in the right, we get the original equation.
Answer 2
Answer: Surprisingly, NONE of the choices is equivalent to. W=fd .

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A net force of 200 newtons is applied to a wagon for 3 seconds. This cause the wagons to undergo a change in momentum of ?

Answers

physics- damon, Monday, December 1, 2014 at 3:27 pm force =change in momentum\ change in time or m a if m is constant 

change in momentum/3=200

change in momentum =3*200 kg m/s

now lets look at a skydiver who jumps out of a plane that has a forward velocity of 40 m/s. ignore air resistance. After 1 second, what is the skydivers forward velocity?

Answers

If there's no air resistance, then there's nothing that has any effect on his forward
velocity. It's still 40 m/s forward, and it WILL be until he hits the ground.

A car battery with a 12 V emf and an internal resistance of 0.11 Ω is being charged with a current of 56 A. What are (a) the potential difference across the terminals, (b) the rate Pr of energy dissipation inside the battery and (c) the rate Pemf of energy conversion to chemical form? When the battery is used to supply 56 A to the starter motor, what are (d) V and (e) Pr

Answers

Answer:

Part a)

V = 18.16 V

Part b)

P_r = 345 Watt

Part c)

P = 672 Watt

Part d)

V = 5.84 V

Part e)

P_r = 345 Watt

Explanation:

Part a)

When battery is in charging mode

then the potential difference at the terminal of the cell is more than its EMF and it is given as

\Delta V = E + i r

here we have

E = 12 V

i = 56 A

r = 0.11

now we have

\Delta V = 12 + (0.11)(56) = 18.16 V

Part b)

Rate of energy dissipation inside the battery is the energy across internal resistance

so it is given as

P_r = i^2 r

P_r = 56^2 (0.11)

P_r = 345 W

Part c)

Rate of energy conversion into EMF is given as

P_(emf) = i E

P_(emf) = (56)(12)

P_(emf) = 672 Watt

Now battery is giving current to other circuit so now it is discharging

now we have

Part d)

V = E - i r

V = 12 - (56)(0.11)

V = 12 - 6.16 = 5.84 V

Part e)

now the rate of energy dissipation is given as

P_r = i^2 r

P_r = 56^2 (0.11)

P_r = 345 W

What is velocity of a particle?

Answers

Velocity of a particle is its speed and the direction in which it is moving.

It can also be described as the instantaneous rate of change of the particle's
distance traveled, and the direction in which the distance is changing.
velocity is generally defined as the distance travelled by a particle in a particular time interval ...........its formula is given as
v=d/t
where v is velocity
         d is distance travelled and
         t is time interval.....
    its units are - kmph , m/s read as kilometers per second and meters per second

For a satellite to stay in orbit around Earth, it has to be moving forward very fast all the time. What force will make it fall to Earth if it goes too slowly?Earth's gravity

the force of friction

the magnetic force from Earth's north pole

the Sun's gravity

Answers


Maintaining an orbit has nothing to do with the satellite's speed.
ANY (tangential) speed is enough to stay in orbit, if the satellite
just stays away from Earth's atmosphere.

If the satellite completely stops moving 'sideways' at all, and just
hangs there, then the forces of gravity between the satellite and
the Earth will pull them together ... the satellite will fall into the
atmosphere and then to the ground.
Most important
Centripetal force which makes it attract towards the earth and makes it able to move around

The greatest obstacle to developing solar energy is _____. lack of sunlight at high latitudes lack of sunlight at night lack of mechanisms for storing solar energy large areas required to collect sufficient energy

Answers

The correct answer is option #4. The greatest obstacle to developing solar energy is large areas required to collect sufficient energy. Solar energy is the energy that is the sun is producing and being converted into thermal energy that can be used for everyone's daily lives.

large areas required to collect sufficient energy
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