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skelet666 [1.2K]

3 years ago

14

Which fossil fuel is used the most for energy production?

1 answer:

algol133 years ago

5 0

A. Coal is used to primarily to produce and generate electricity and it is responsible for 39 percent of the power supply for the united states.

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two objects were lifted by machine one object had a massive 2 kg it was lifted at a speed of 2 m/s the other had a massive 4 kg

rosijanka [135]

Kinetic energy =(1/2) (mass) (speed²)

First object: KE = (1/2) (2 kg) (2m/s)² = 4 joules during the lift.

Second object: KE = (1/2) (4kg) (3 m/s)² = 18 joules during the lift.

The second object has more kinetic energy while it's being lifted
than the first object has while it's being lifted. Once they reach their
final heights and stop, neither object has any kinetic energy.

8 0

4 years ago

A +15 nC point charge is placed on the x axis at x = 1.5 m, and a -20 nC charge is placed on the y axis at y = -2.0m. What is th

IceJOKER [234]

Answer: $E=75\ N/m$

Explanation:

Given

First charge of $q_1=15\ nC$ is placed at $x=1.5\ m$

Second charge $q_2=-20\ nC$ is placed at $y=-2\ m$

Electric field is given by

$E=\frac{kq}{r^2}$

Electric field due to $q_1$ is away from it

$E_1=\frac{9\times 10^9\times 15\times 10^{-9}}{(1.5)^2}$

$E_1=60\ N/m$

Electric field due to $q_2$

$E_2=\frac{9\times 10^9\times 20\times 10^{-9}}{2^2}$

$E_2=45\ N/m$

Net electric field will be vector addition of two

$\vec{E_{net}}=\vec{E_1}+\vec{E_2}$

$\vec{E_{net}}=-60\hat{i}-45\hat{j}$

Magnitude of Electric field is

$E=\sqrt{60^2+45^2}$

$E=75\ N/m$

8 0

3 years ago

A gas has an initial volume of 168 cm3 at a temperature of 255 K and a pressure of 1.6 atm. The pressure of the gas decreases to

grandymaker [24]

P1V1/T1 = P2V2/T2

(1.6atm)(168cm^3)/(255K) = (1.3atm)V2/(285K)

Final volume = 231cm^3

6 0

4 years ago

A student measure the length of a laboratory bench with a meter ruler. Which of the following values is the most approbriate way

PtichkaEL [24]

Answer:

Well a meter stick has increments of a centimeter, and since 1 cm=0.01m he should record it as 4.02m(b)

Explanation:

8 0

3 years ago

Which trait shared by dolphins and bats possibly lead to the evolution of echolocation in these two animal groups?

s344n2d4d5 [400]

The need to quickly move through dark environments. <span />

6 0

3 years ago

Read 2 more answers