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
Tanzania [10]
3 years ago
7

You are in a speedboat on a river moving in the same direction as the current. The speedometer on the boat shows that its speed

is 20 km/h. However, a person on the shore measures the boat's speed as 23 km/h. How is this possible?
Physics
1 answer:
zloy xaker [14]3 years ago
5 0
From the reference point of the river, the speed of the boat is 20 km/h. From the reference point of someone standing on the shore, the speed of the boat is the speed on the speedometer plus the downstream speed of the current.
You might be interested in
calculate the density of a neutron star with a radius 1.05 x10^4 m, assuming the mass is distributed uniformly. Treat the neutro
Orlov [11]

To develop this problem it is necessary to apply the concepts related to the proportion of a neutron star referring to the sun and density as a function of mass and volume.

Mathematically it can be expressed as

\rho = \frac{m}{V}

Where

m = Mass (Neutron at this case)

V = Volume

The mass of the neutron star is 1.4times to that of the mass of the sun

The volume of a sphere is determined by the equation

V = \frac{4}{3}\pi R^3

Replacing at the equation we have that

\rho = \frac{1.4m_{sun}}{\frac{4}{3}\pi R^3}

\rho = \frac{1.4(1.989*10^{30})}{\frac{4}{3}\pi (1.05*10^4)^3}

\rho = 5.75*10^{17}kg/m^3

Therefore the density of a neutron star is 5.75*10^{17}kg/m^3

4 0
3 years ago
Who’s good at algebra?
lutik1710 [3]

Answer:

I'm alright................

5 0
3 years ago
Read 2 more answers
Please help im being timed on this and need to get my grade up
nadya68 [22]

Answer:

a I think hope this helps

8 0
3 years ago
Two identical loudspeakers 2.30 m apart are emitting sound waves into a room where the speed of sound is 340 m/s. Abby is standi
Dimas [21]

Answer:

Abby is standing (4.5^2 + 2.3^2)^1/2   from the far speaker

D2 = 5.05 m from the far speaker

The difference in distances from the speakers is

5.05 - 4.5 = .55 m     (Let y be wavelength, lambda)

n y = 4.5

(n + 1) y = 5.05 for the speakers to be in phase at smallest wavelength

y = .55 m          subtracting equations

f = v / y = 340 / .55 = 618 / sec     should be the smallest frequency

8 0
3 years ago
What happens to most of the light waves that strike a clear pane of glass? O A. absorption B. diffraction O C. reflection O D. t
Lorico [155]

Answer:reflection

Explanation:

5 0
3 years ago
Other questions:
  • A small sphere with mass 5.00×10−7 kg and charge +8.00 μC is released from rest a distance of 0.500 m above a large horizontal i
    7·1 answer
  • Which term is defined as long chains of carbon molecules?
    15·2 answers
  • What happens to baseball cap in the rain?
    15·1 answer
  • A particle's position along the x-axis is described by. x(t)= At+Bt^2where t is In seconds: x is in meters: and the constants A
    11·1 answer
  • What are the independent and dependent variables?
    11·1 answer
  • All electromagnetic waves have the same speed in which of the following?
    11·1 answer
  • If the period of a given wave is 6 seconds, what is the frequency of the wave?
    7·1 answer
  • PLEASE HELP WILL MARK BRAINLIEST
    12·1 answer
  • The lamp cord is 85cm long and comprises cupper wire. Calculate the wire‘s resistance?
    9·1 answer
  • Ai. What are ruminants?
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!