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
ddd [48]
2 years ago
9

7. A runner runs on the track field with a velocity of 20 m/s and it is known that her momentum is

Physics
1 answer:
Dennis_Churaev [7]2 years ago
4 0

Answer:

Weight of the runner is 60 kilograms

Explanation:

Momentum is the product of weight and velocity.

The formula is : p=mv   where m is mass in kg and v is velocity in m/s

Given in the question ;

v= 20 m/s  and p=1200 kg*m/s

Applying the formula as;

p= mv

1200 = m * 20

1200/20 = m

60 kg = m

You might be interested in
What must happen to an atom of magnesium in order to become a magnesium ion
Zielflug [23.3K]
I would assume that the magnesium would have to come into contact with an ion in order to become a magnesium ion. 
6 0
2 years ago
The wavelength of light that has a frequency of 1.20 × 1013 s-1 is ________ m.
klio [65]
The relationship between frequency and wavelength for an electromagnetic wave is
c=f \lambda
where
f is the frequency
\lambda is the wavelength
c=3 \cdot 10^8 m/s is the speed of light.

For the light in our problem, the frequency is f=1.20 \cdot 10^{13} s^{-1}, so its wavelength is (re-arranging the previous formula)
\lambda= \frac{c}{f}= \frac{3 \cdot 10^8 m/s}{1.20 \cdot 10^{13} s^{-1}}=  2.5 \cdot 10^{-5}m
8 0
3 years ago
(a) The Sun orbits the Milky Way galaxy once each 2.60 x 108y , with a roughly circular orbit averaging 3.00 x 104 light years i
PilotLPTM [1.2K]

Answer:

Part a)

a_c = 1.67 \times 10^{-10} m/s^2

Part b)

v = 2.18 \times 10^5 m/s

Explanation:

Time period of sun is given as

T = 2.60 \times 10^8 years

T = 2.60 \times 10^8 (365 \times 24 \times 3600) s

T = 8.2 \times 10^{15} s

Now the radius of the orbit of sun is given as

R = 3.00 \times 10^4 Ly

R = 3.00 \times 10^4 (3\times 10^8)(365 \times 24 \times 3600)m

R = 2.84 \times 10^20 m

Part a)

centripetal acceleration is given as

a_c = \omega^2 R

a_c = \frac{4\pi^2}{T^2} R

a_c = \frac{4\pi^2}{(8.2\times 10^{15})^2}(2.84 \times 10^{20})

a_c = 1.67 \times 10^{-10} m/s^2

Part b)

orbital speed is given as

v = \frac{2\pi R}{T}

v = \frac{2\pi (2.84 \times 10^{20})}{8.2 \times 10^{15}}

v = 2.18 \times 10^5 m/s

5 0
3 years ago
What is the condition for the machine to be perfect?​
Roman55 [17]
I’m not really sure
8 0
3 years ago
Read 2 more answers
Cloudy nights are usually warm because​
almond37 [142]

Answer:

When you have a cloudy night, the clouds prevent heat from escaping through the atmosphere and into space.

The clouds act like a blanket and trap the heat it, and that is why every time you have a cloudy night, it is always warmer than a clear night.

5 0
2 years ago
Other questions:
  • Which term refers to the rate of change of motion?
    7·1 answer
  • What is the most common gas in the atmosphere
    13·2 answers
  • What is the acceleration of a 30.0-kg go kart if the thrust of its engine is 300.0 N?
    12·2 answers
  • Find the dimension of volume​
    9·1 answer
  • What is the speed of gravity
    15·1 answer
  • Why does a partially inflated weather balloon expand as it rises?
    12·2 answers
  • Why screw drivers with long arm are better in use?
    5·2 answers
  • At room temperature what is the strength of the electric field in a 12-gauge copper wire (diameter 2.05 mm that is needed to cau
    12·1 answer
  • 4. List 3 detailed examples of Newton's 3rd Law.
    5·2 answers
  • A submarine is stranded on the bottom of the ocean with its hatch 25 m below the surface. In this problem, assume the density of
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!