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
suter [353]
2 years ago
5

A river 800m wide flows at the rate of 5km/h . A swimmer who can swim at 10km/h in still water wants to cross the river straight

.
Along what direction must he strike ?

Please solution with explanation
Physics
1 answer:
LuckyWell [14K]2 years ago
6 0

Answer:

At an angle of 30^{\circ}

Explanation:

Assume the river flows from East to West so for the swimmer to cross across it, assume he crosses it from West to East.

The resultant speed will be given by

R= \sqrt {10^{2}-5^{2}=\sqrt {75}\approx 8.66 km/h\\Direction=sin^{-1}\frac {5}{10}\approx 30^{\circ}

You might be interested in
The fourth harmonic on a string fixed at both ends shows
Charra [1.4K]

Answer:

I believe the answer is B) Two wavelengths

8 0
2 years ago
A sand core used to form the internal surfaces of a steel casting experiences a buoyancy force of 225 n. the volume of the mold
pashok25 [27]

Newton’s second law gives us the relationship of force F, mass m and acceleration a. The formula is given as:

<span>F = m a                  --> 1</span>

However we also know that the relationship of mass m, density ρ, and volume V is:

<span>m = V ρ                 --> 2</span>

Therefore substituting equation 2 to equation 1:

F = ρ V a = ρ V g

where a is acceleration due to gravity, ρ is density of water and V is the volume of the casting, therefore:

F = (1x10^-3 kg/cm^3) (4840 cm^3) (9.8 m/s^2)

F = 47.432 kg m/s^2

F = 47.432 N

 

Going back to equation 1:

47.432 N = m (9.8 m/s^2)

m = 4.84 kg

 

<span>Hence the weight of the final casting is 4.84 kg</span>

5 0
3 years ago
What evidence supports the theory that there is a black hole at the center of our galaxy?
777dan777 [17]

Explanation:

Scientist and astronomers have observed that large gas clouds and massive stars are orbiting around in an accelerated manner in center of our galaxy that is milky way. A massive star S2's motion has been studied and it is found that the star is revolving around the center of the galaxy. From this scientist have confirmed presence of super massive black hole of 3 million solar masses lurking around the center of milky way.

3 0
3 years ago
A television set is plugged into a 120 V outlet. The television circuit carries a current equal to 0.75 A. What is the overall r
Arlecino [84]

Answer:

20,00

Explanation:

This is the answer

7 0
2 years ago
A _______ is a repeating disturbance or vibration that transfers or moves energy from place to place without transporting mass.
s344n2d4d5 [400]

Answer:the answer is wave.

Explanation:

8 0
2 years ago
Other questions:
  • For communication to take place, there has to be:
    8·1 answer
  • Find the length l of one "arch" of this cycloid, that is, find the distance traveled by a small stone stuck in the tread of a ti
    5·2 answers
  • PLZZ ANSWER THE QUESTION ​
    6·1 answer
  • Which compound is most likely a powerful and dangerous acid? H2S HBr Li2O LiBR
    13·2 answers
  • For a maximum superelevation of 0.08 ft/ft and a degree of curve of 4o, calculate the maximum safe speed for the curve assuming
    10·1 answer
  • Which federal agency protects ecosystems and supervisors public access the forests
    7·2 answers
  • A narrow region between two air masses of different densities is a
    11·1 answer
  • What is the fundamental frequency of a 0.003 kg steel piano wire of length 1.3 m and under a tension of 2030 N? Answer in units
    9·1 answer
  • Mickey walks Pluto 4 miles North to the dog park. Mickey finds beautiful
    10·1 answer
  • What is the value of acceleration of a body if it is in uniform velocity​
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!