1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
leva [86]
3 years ago
7

The star Betelgeuse is about 600 light-years away. If it explodes tonight,

Physics
2 answers:
lana [24]3 years ago
6 0

The star Betelgeuse is about 600 light-years away.

If it explodes tonight, we won't know about it until 600 years from now. <em>(C)</em>

(Maybe it already has.  If it exploded any time after the year 1419, we have no way to know it yet.)

Thepotemich [5.8K]3 years ago
4 0

Answer:

C

Explanation:

It has to travel 600 light years before we would be able to observe the explosion.

You might be interested in
A block of mass 5 kg is descending with a constant velocity on an inclined plane at 30°. What is the value of the frictional for
sattari [20]

Answer:28.9N

Explanation:

F=UR R=mg R=5×10 R=50N

U=tan© U=Tan30 U=1/√(3)

F=UR F=1/√(3) ×50

F=28.9N

4 0
2 years ago
What is the meaning of viscosity?
Vera_Pavlovna [14]

the state of being thick, sticky, and semifluid in consistency, due to internal friction.

5 0
2 years ago
The power of a purely resistive lead is always positive although the current and voltage are sometimes negative. explain​
pickupchik [31]

Answer:

Current is in phase with voltage in a resistive circuit. Note that the wave form for power is always positive, never negative for this resistive circuit. This means that power is always being dissipated by the resistive load, and never returned to the source as it is with reactive loads.Explanation:

7 0
2 years ago
In an aqueous solution where the H+ concentration is 1 x 10-6 M, the OH concentration must be:
vesna_86 [32]

Answer:

D. 1×10⁻⁸ M

Explanation:

[H⁺] [OH⁻] = 10⁻¹⁴

(1×10⁻⁶) [OH⁻] = 10⁻¹⁴

[OH⁻] = 1×10⁻⁸

6 0
3 years ago
Enter your answer in the provided box. The mathematical equation for studying the photoelectric effect is hν = W + 1 2 meu2 wher
siniylev [52]

Answer:

v = 4.44 \times 10^5 m/s

Explanation:

By Einstein's Equation of photoelectric effect we know that

h\nu = W + \frac{1}{2}mv^2

here we know that

h\nu = energy of the photons incident on the metal

W = minimum energy required to remove photons from metal

\frac{1}{2}mv^2 = kinetic energy of the electrons ejected out of the plate

now we know that it requires 351 nm wavelength of photons to just eject out the electrons

so we can say

W = \frac{hc}{351 nm}

here we know that

hc = 1242 eV-nm

now we have

W = \frac{1242}{351} = 3.54 eV

now by energy equation above when photon of 303 nm incident on the surface

\frac{1242 eV-nm}{303 nm} = 3.54 eV + \frac{1}{2}(9.1 \times 10^{-31})v^2

4.1 eV = 3.54 eV + (4.55 \times 10^{-31}) v^2

(4.1 - 3.54)\times 1.6 \times 10^{-19}) = (4.55 \times 10^{-31}) v^2

8.96 \times 10^{-20} = (4.55 \times 10^{-31}) v^2

v = 4.44 \times 10^5 m/s

6 0
3 years ago
Other questions:
  • A 6.41 $\mu C$ particle moves through a region of space where an electric field of magnitude 1270 N/C points in the positive $x$
    7·1 answer
  • When gravitational field lines get farther apart, the gravitational field _________.
    11·1 answer
  • A node is a point on a standing wave that has no displacement from the rest position. at the nodes, _____.
    15·2 answers
  • If a rooster lays and egg on the middle of the roof, which way does the egg role?
    6·1 answer
  • You carry a 5 kg sack of potatoes across the store for 5 minutes, and you wait in line holding it for 30 seconds before you get
    12·1 answer
  • Which of the following is NOT a physical mechanism that causes air to rise?A) orographic liftingB) frontal wedging C) adiabatic
    11·1 answer
  • A light bulb is connected to a 2V supply and experiences a current of 6.4A. What is the power rating of the bulb?
    9·1 answer
  • A 5.0 Ω resistor is hooked up in series with a 10.0 Ω resistor followed by a 20.0 Ω resistor. The circuit is powered by a 9.0 V
    8·1 answer
  • Two rubber bullets (each of the same mass) are fired at the same velocity towards two different blocks of equal mass. One block
    15·1 answer
  • What is 2+2 is 4 - 1 =??<br><br><br><br> Know your memes!
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!