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3 years ago

A bus is moving forward at 20 m/s. A student on the bus throws a tenis ball horizontally at

Physics

1 answer:

seraphim [82]3 years ago

8 0

Answer:

D: 35 m/s

Explanation:

The bus is moving at a speed of 20 m/s.

Thus; v_bus = 20 m/s

Tennis ball thrown horizontally towards the front of the bus is given as 15 m/s.. Thus, v_ball = 15 m/s

No, due to the fact that the bus and the ball are moving at the same time, an observer will think the speed is the sum of that of the ball and the bus.

Thus, it will appear to an observer on the sidewalk that the speed is; v_bus + v_ball = 20 + 15 = 35 m/s

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You attend a football game one day and notice a long time difference between when the other side of the stadium stands up to che

elena-14-01-66 [18.8K]

Answer: C it was located at a higher altitude

Explanation:

none of the other ones make any sense so it definitely c

6 0

4 years ago

Am I correct? Plz answer ASAP! I will give brainilest:D (Science)

aivan3 [116]

Answer:

I would agree with your selection.

Explanation:

3 0

3 years ago

Astronomers discover an exoplanet, a planet obriting a star other than the Sun, that has an orbital period of 3.27 Earth years i

Naddik [55]

Answer:

r = 3.787 10¹¹ m

Explanation:

We can solve this exercise using Newton's second law, where force is the force of universal attraction and centripetal acceleration

F = ma

G m M / r² = m a

The centripetal acceleration is given by

a = v² / r

For the case of an orbit the speed circulates (velocity module is constant), let's use the relationship

v = d / t

The distance traveled Esla orbits, in a circle the distance is

d = 2 π r

Time in time to complete the orbit, called period

v = 2π r / T

Let's replace

G m M / r² = m a

G M / r² = (2π r / T)² / r

G M / r² = 4π² r / T²

G M T² = 4π² r3

r = ∛ (G M T² / 4π²)

Let's reduce the magnitudes to the SI system

T = 3.27 and (365 d / 1 y) (24 h / 1 day) (3600s / 1h)

T = 1.03 10⁸ s

Let's calculate

r = ∛[6.67 10⁻¹¹ 3.03 10³⁰ (1.03 10⁸) 2) / 4π²2]

r = ∛ (21.44 10³⁵ / 39.478)

r = ∛(0.0543087 10 36)

r = 0.3787 10¹² m

r = 3.787 10¹¹ m

7 0

4 years ago

Problem: A lossless 50-Ω transmission line is terminated in a load with ZL = (50 + j25) Ω. Use the Smith chart to find the follo

Nadya [2.5K]

Answer: (a). ΓL = 0.246 < 75°

(b). S = 1.7

(c). Zin = (30-j)λ

(d). jreal = Arc Po = 0.105λ

(e). jmax = jreal = 0.105λ

Explanation:

attached is a document to help in understanding.

So we will begin with a step by step analysis of the problem.

from the diagram we have that ZL = (50 + j25) Ω.

where ZL = ZL / Z₀ = 50 + j25 / 50 = 1 + j0.5

so we mark this on the chart as point 'P'

(a) ΓL = mP/m 'P' < Θ L = 1.7/6.9 < 75°

ΓL = 0.246 < 75°

(b) This s-circle 's' is given thus s = r = 1.7 on the RHS of the chart

S = 1.7

ζin = Q = 0.6 - j0.02

therefore Zin = Z₀ζin = 50(0.6 - j0.02) = (30-j)λ

Zin = (30-j)λ

(d) here we are taking R as the diameter opposite of Q on the s=circle

so R = γin = 1.7 + j0.02

yin = yo (γin) = (1.7+j0.02) / 50 = (34 + j0.4)ms

yin = (34 + j0.4)ms

(e) move from 'p' on s-circle to 'o'

where maximum impedance = Znxl = Zos

which gives jreal = Arc Po = 0.105λ

(f) jmax = jreal = 0.105λ

cheers i hope this helps

3 0

3 years ago

When discharging, what percentage of the starting voltage will the capacitor reach after 5rc?

Ahat [919]

When discharging equivalent of 0% starting voltage will the capacitor reach after 5RC.

V(t) = V0e-t/RC = V0b initially.

<h3>What is capacitor?</h3>

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Capacitance refers to a capacitor's effect.
The terminals in a capacitor are connected to two metal plates that are spaced apart by a dielectric, a non-conducting material.
Two pieces of aluminum foil, along with a piece of paper, can be used to create a capacitor (and some electrical clips).
It won't have a lot of storage capacity, so it won't be a great capacitor, but it will still function.

<h3>What are the different types of capacitors?</h3>

The numerous kinds of capacitors and their applications.

Frequently utilized in radio tuning circuits is air.

Mylar: The material most frequently used in timer circuits for clocks, alarms, and counting.

Good for high-voltage applications is glass.

Ceramic is used in X-ray, MRI, and other high-frequency devices.

a powerful capacitor fuels hybrid and electric vehicles.

Learn more about capacitors here:

brainly.com/question/17584935

#SPJ4

6 0

2 years ago