All categories

3 years ago

The energy efficiency of a car is approximately 20%. If you put 10 gallons of gas into the car, how many gallons are “wasted”?

1 answer:

4 0

First, you find what 20% of 10 gallons of gas would be. This will show how many gallons the car actually uses.
10 gallons x 20% =
10 x 0.20 =
2 gallons used

Then you subtract that number from the total 10 gallons to get how many gallons of gas would be wasted.
10 gallons - 2 gallons =
8 gallons of gas wasted

You might be interested in

What is the equivalent resistance of a circuit that contains four 75.02

viktelen [127]

Answer:

option A is the correct answer

3 0

2 years ago

A 55 kg cheerleader uses an oil-filled hydraulic lift to hold four 110 kg football players at a height of 1.0 m. If her piston i

AVprozaik [17]

Answer:

$D = 55.2 cm$

Explanation:

As we know that the total mass of the all four players is given as

$M = 4\times 110$

$M = 440 kg$

diameter of the piston of cheer leader is given as

$d_1 = 16 cm$

are of cross-section is given as

$A_1 = \pi r^2$

$A_1 = \pi(0.08)^2 = 0.02 m^2$

mass of the cheer leader is given as

m = 55 kg

so the pressure due to cheer leader is given as

$P_{in} = \frac{mg}{A_1}$

$P_{in} = \frac{55 \times 9.81}{0.02}$

$P_{in} = 26835 Pa$

Now on the other side pressure must be same

so we have

$\frac{Mg}{A} + \rho gH = P_{in}$

$\frac{440 \times 9.8}{A} + (900)(9.8)(1) = 26835$

$A = 0.24 m^2$

$\pi r^2 = 0.24$

$r = 0.276 m$

so diameter on the other side is given as

$D = 2 r$

$D = 55.2 cm$

8 0

3 years ago

Sound waves are mechanical waves. Which statement is true for this type of wave?Select one of the options below as your answer:.

Alexandra [31]

By being a Mechanical Wave, which requires a material medium:

D. Sound waves require a medium in order to transport energy

8 0

3 years ago

Read 2 more answers

If all of the forces acting on an object balance so that the net force is zero, then

nadya68 [22]

The answer is (A) the object must be at rest.

When all of the forces acting on an object balance, the net force is zero and hence the object will not move.

Yes, the direction might also change under some special circumstances.

6 0

4 years ago

You want to paddle a boat straight across the Mississippi River. You are able to paddle the boat with a speed of 2.2 m/s relativ

lbvjy [14]

Answer:

C) 90 degrees

Explanation:

If we could have an imaginative illustration about what the question is all about.

We could think of the velocity of the river (V_r cosθ) as a horizontal component and the velocity of the boat (V_b sinθ) as the vertical component.

So the velocity of the boat V_b = 2.2 m/s; &

the velocity of the river V_r = 1.1 m/s

∴

The minimum time (which is the shortest time) required for the boat to cross the river is θ = 90°

the time require is:

$t = \dfrac{d}{v_b \ sin \theta}$

$t = \dfrac{95}{2.2}$

t = 43.18 sec

8 0

3 years ago