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
mars1129 [50]
3 years ago
14

Marina walked 2km in half an hour, what was her average speed during her walk?

Physics
1 answer:
ad-work [718]3 years ago
6 0

Answer:

4km/hr

Explanation:

You might be interested in
A skateboarder with a mass of 45 kilograms is riding on a skateboard with a mass of 2.5 kilograms. What should be the velocity o
klasskru [66]
So momentum is just velocity times mass, this means Momentum = Velocity x Mass.
We can rearrange this to be Velocity = Momentum/Mass.

Since we know momentum and mass we can now solve.

Velocity = 264/(45+2.5)
              = 5.56 m/s
5 0
3 years ago
Read 2 more answers
Is there life on other planets ?
RUDIKE [14]
Supposedly there is life on Mars but it’s early to say for sure
7 0
3 years ago
Read 2 more answers
1. Which wave refracts?
Digiron [165]

Answer:

I want to say your answer is A) an ocean wave approaching the shore at an angle. But not 100% sure. I'm so sorry if it's wrong I really tried to figure it out.

Explanation:

Refraction of waves involves a change in the direction of waves as they pass from one medium to another. Refaction , or the bending of the path of the waves, is accompanied by a change in speed and wavelength of the waves. Thus, if water waves are passing from deep water into shallow water, they will slow down. ( This is what I read on google maybe it'll help you out).

8 0
3 years ago
In a photoelectric effect experiment, electrons emerge from a copper surface with a maximum kinetic energy of 1.10 eV when light
Sladkaya [172]

Answer:A) 220 nm

Explanation:

Given

Maximum Kinetic Energy K.E.=1.10 eV

Work Function W=4.65 eV

from Einstein Equation

h\mu =W+K.E.

h\cdot \frac{c}{\lambda }=W+K.E.

h\cdot \frac{c}{\lambda }=4.65+1.10

6.626\times 10^{-34}\cdot \frac{3\times 10^8}{\lambda }=5.75

1 eV=1.6\times 10^{-19} J

thus 5.75 eV=9.2\times 10^{-19} J

\lambda =\frac{6.626\times 10^{-34}\time 3\times 10^8}{9.2\times 10^{-19}}

\lambda =216.06 nm\approx 220 nm

6 0
3 years ago
Select the correct answers from the list.(1 point) A black hole begins to form as an aging star abruptly collapses when it cease
Anika [276]

A black hole forms as a star collapses when it ceases emitting radiation from fusion reactions. This occurs after the star has consumed hydrogen, helium, then through iron.

Star evolution refers to the process by which stars evolve (change) over time.

A black hole can be defined as a collapsed star where the gravitational field in its nucleus becomes greater than particles cannot escape from it.

In consequence, black holes are cosmic bodies in which gravity is so powerful that nothing (i.e., particles, radiation, light, etc.) can escape from them.

Nuclear fusion refers to the energy reactions produced by the fusion of hydrogen at the core of a star, thereby becoming helium.

Learn more about black holes here:

brainly.com/question/10597324

5 0
2 years ago
Read 2 more answers
Other questions:
  • What is the final concentration of DD at equilibrium if the initial concentrations are [A][A]A_i = 1.00 MM and [B][B]B_i = 2.00
    11·1 answer
  • What part of the brain is referred to as the seat to consciousness?
    10·1 answer
  • What determines the frequency and amplitude of a vibrating object?
    8·1 answer
  • 8. A person with a mass of 15 kg is walking on a flat surface at a velocity of 5 m/s. What is the walker's momentum?
    5·1 answer
  • How much force do you push down on the Earth with? (Hint: 1kg is about 2 pounds).​
    5·2 answers
  • Can someone help with these/
    8·1 answer
  • Explain how an object can have force acting on it but not be acceleration?
    5·1 answer
  • Consult Multiple-Concept Example 11 for background material relating to this problem. A small rubber wheel on the shaft of a bic
    7·1 answer
  • The image of an object placed 30cm from a diverging lens is formed 10cm in front of the lens.
    15·1 answer
  • Q1.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!