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
Ahat [919]
3 years ago
9

What did Edwin Hubble discover about galaxies that allowed him to determine the expansion rate of the universe?

Physics
1 answer:
mario62 [17]3 years ago
6 0
<span> The farther away a galaxy is, the more its light
is shifted toward the red end of the spectrum. (C)</span>
You might be interested in
an object weighs 98 n on earth. How much does it weigh on planet x where the acceleration due to gravity in 6 m/s^2
Degger [83]
60 N because 98N=mg (here g= 9.8 on earth) thus mass can be calculated which is 98/9.8 = 10kg Now,new weight with g = 6m/s^2 =m×g' (here g' is new acceleration of the new planet) = 10×6=60N
7 0
3 years ago
Read 2 more answers
3 In a television tube, an electron starting from rest experiences a force of 4.0 × 10−15 N over a distance of 50 cm. The final
MAXImum [283]

Answer:

The final speed of the electron = 2.095×10⁸ m/s

Explanation:

From newton's fundamental equation of dynamics,

F = ma ........................Equation 1

Where F = force, m = mass of the electron, a = acceleration of the electron.

making a the subject of the equation,

a = F/m.................... Equation 2

Given: F = 4.0×10⁻¹⁵ N,

Constant: m =  9.109×10⁻³¹ kg.

Substituting into equation 2

a = 4.0×10⁻¹⁵/9.109×10⁻³¹

a = 4.39×10¹⁶ m/s².

Using newton's equation of motion,

v² = u²+2as .......................... Equation 3

Where v = final velocity of the electron, u = initial velocity of the electron, a = acceleration of the electron, s = distance covered by the electron.

Given: u = 0 m/s(at rest), s = 50 cm = 0.5 m, a = 4.39×10¹⁶ m/s²

Substituting into equation 3

v² = 0² + 2(0.5)(4.39×10¹⁶)

v = √(4.39×10¹⁶)

v = 2.095×10⁸ m/s

Thus the final speed of the electron = 2.095×10⁸ m/s

7 0
3 years ago
An ion accelerated through a potential difference of 115 V experiences an increase in kinetic energy of 7.37 x 1017 J. Calculate
riadik2000 [5.3K]

Answer: 6.408(10)^{-19} C

Explanation:

This problem can be solved by the following equation:

\Delta K=q V

Where:

\Delta K=7.37(10)^{-17} J is the change in kinetic energy

V=115 V is the electric potential difference

q is the electric charge

Finding q:

q=\frac{\Delta K}{V}

q=\frac{7.37(10)^{-17} J}{115 V}

Finally:

q=6.408(10)^{-19} C

4 0
3 years ago
Which statement about convection is correct?
AlekseyPX
<span>D. Convection occurs when heated particles of a material flow toward areas having less thermal energy. This movement of particles can only occur in gases and liquids, not solids.</span>
7 0
3 years ago
Read 2 more answers
Name two objects that both use electric motors and are commonly found in houses
Natali [406]
There's the fan over the stove and in the microwave oven, the dispose-all under the sink, the blender, the washer, the dryer, vacuum cleaner, hair dryer, and there are many in a computer.

Hope this helps!
3 0
3 years ago
Read 2 more answers
Other questions:
  • Magma can partially crystallize at depth and then rise to shallow depths where the remaining magma solidifies. the early-formed
    11·1 answer
  • True or False<br><br> The greater the speed of an object, the less kinetic energy it possesses.
    7·2 answers
  • What is the change in its velocity, v, during this 0.80-s interval?
    13·1 answer
  • In the absence of air resistance and friction, what will happen to the velocity of an object going at 20 m/s E?
    12·1 answer
  • If an element has a charge of 1+, how many more protons does it have than electrons?
    7·1 answer
  • The sun generates both mechanical and electromagnetic waves. Which statement about those waves is true?
    14·1 answer
  • Halley's comet orbits the sun roughly once every 76 years. It comes very close to the surface of the Sun on its closest approach
    8·1 answer
  • An 8 kg cat is running 4 m/s. How much kinetic energy does it have?
    12·1 answer
  • Calculate the mechanical advantage of a pulley system if only 10 lb is required to lift a 500 lb block.
    9·1 answer
  • Tuklasin
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!