4 years ago

What is the minimum v (in km/s) the rocket engines must provide to allow the craft to escape from the Earth?

Physics

1 answer:

coldgirl [10]4 years ago

3 0

Answer:

11 kilometers (7 miles) per second, or over 40,000 kilometers per hour (25,000 miles per hour)

Explanation:

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How high will a 0.345 kg rock go if thrown straight up by someone who does 111 J of work on it? Neglect air resistance.

Eddi Din [679]

To solve this problem we will apply the concepts related to energy conservation. Here we will understand that the potential energy accumulated on the object is equal to the work it has. Therefore the relationship that will allow us to calculate the height will be

$W = PE$

$W = mgh$

Here,

m = mass

g = Acceleration due to gravity

h = Height

our values are,

$m = 0.345 kg$

$g = 9.8m/s^2$

$W = 111J$

Replacing,

$W =mgh$

$111 = (0.345)(9.8)h$

$h = 32.83m$

Then the height is 32.83m.

7 0

3 years ago

If electrical current is moving through a horizontal wire toward your face, what direction is the induced magnetic field?

adoni [48]

Answer:(b)

Explanation:

Given

Electric current flowing through the horizontal wire towards the observer's face.

The direction of the magnetic field is given by the right-hand thumb rule, i.e. place the thumb in the direction of current and the wrapping of fingers will give the direction of the magnetic field

the direction of the magnetic field will be counterclockwise as observed by an observer.

4 0

3 years ago

Consider two copper wires. one has twice the length and twice the cross-sectional area of the other. how do the resistances of t

Anestetic [448]

Answer:

R = ρ L / A where R is the resistance and ρ the resistivity:

R2 / R1 = (L2 / A2) / (L1 / A1) = L2 * A1 / (L1 * A2)

R2 / R1 = (2 L * A) / (L * 2 A) = 1

Their resistances should be the same.

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2 years ago

A man stands at the midpoint between two speakers that are broadcasting an amplified static hiss uniformly in all directions. Th

LiRa [457]

Answer:

A) total intensity = 5x10^-4W/m2

B) total intensity = 5.34x10^-4W/m2

Explanation:

Detailed explanation and calculation is shown in the image below

8 0

3 years ago

How much does a 1 pound rock weigh

Paraphin [41]

1 pound

0.453592 KG

16 ounces

5 0

3 years ago