Which of the following is an example of diffraction? A. Hearing a band play through an open doorway without seeing them. B. Sitting in a room and watching a band play. C. Playing in a band. D. None of these examples show diffraction.

Answers

Answer 1

Answer: A because diffraction is the bending of waves around small obstacles or openings. That’s why you can hear a band through an open doorway without seeing them

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What is the velocity of a 500-kilogram elevator that has 4,000 joules of energy?

Answers

The velocity of a 500-kilogram elevator that has 4,000 joules of energy is 4m/s.

KINETIC ENERGY:

The kinetic energy of a substance is its energy during motion. It can be calculated using the formula below:

K.E = ½m.v²

Where;

m = mass of the elevator (kg)

v = velocity of the elevator (m/s)

According to this question, the energy of the 500kg elevator is given as 4,000 joules, hence, the velocity can be calculated as follows:

V = √K.E × 2/m

V = √4000 × 2/500

V = √8000/500

V = √16

V = 4m/s

Therefore, the velocity of a 500-kilogram elevator that has 4,000 joules of energy is 4m/s.

Learn more: brainly.com/question/10703928?referrer=searchResults

The Energy is Kinetic Energy.

Kinetic Energy = 1/2*mv², Where m is mass in kg, v is velocity in m/s

Energy is 4000 Joules, v = ?
mass, m = 500kg

1/2*mv² = E

1/2*500*v² = 4000

v² = (2*4000) / (500) Using a calculator

v² = 16 Taking square root

v = √16

v = 4

Velocity of object is 4 m/s.

if a train travelling at 10m/s starts to accelerate at 1m/s^2 for 15s on a straight track, calculate its final speed in m/s

Answers

Answer:

-5 m/s

Explanation:

vo = 10 m/s

a = -1 m/s²

t = 15 s

v = vo + at

= 10 + (-1)(15)

= -5 m/s

(actually the train has come to a stop at t = 10s)

Which of the following is not a type of pulley systemA fixed
B movable
C combination
D advantageous

Answers

D advantageousA pulley is a wheel on an axle or shaft that is designed to support movement and change of ... The drive element of a pulley system can be a rope, cable, belt, or chain that runs over the pulley.

A negatively - charged object has an excess of ?

Answers

The object has an exes amount of electrons

A marble is thrown horizontally with a speed of 15.0 m/s from the top of a building. When it strikes the ground, the marble has a velocity that makes an angle of 65.0° with the horizontal. From what height above the ground the marble was thrown. How far from the base of the building, did the marble land?

Answers

The answer is 52.79 m.

I used this formula to get the formula for Vy:
v^2=vi^2+2(a)(x)
And got
Vy=square root (19.6 h)

Then I used that and put it in this formula:

tan(65) =Vy/Vx

tan(65) = square root (19.6 h)/15.0

Then I rearranged it to:

h=[(15.0)(tan65)]/19.6

h=52.79 m

The answer for this question is 52.79

True or False.. Although the Kinetic Theory of Matter states that the particles that make up all matter are in perpetual motion, we know that this isn’t really correct because solids don’t move.

Answers

The answer is false because kinetic energy contains motion!

The answer is false because the Kinetic Theory of Matter does not involve particles that make up all matter

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An observer on the earth sees a spaceship approaching at 0.54c. The ship then launches an exploration vehicle that, according to the earth observer, approaches at 0.82c. What is the velocity of the exploration vehicle relative to the spaceship? Give your answer as a decimal fraction of c, i.e. a β factor.

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