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
pochemuha
3 years ago
7

How am I supposed to solve this?

Physics
2 answers:
RSB [31]3 years ago
7 0

Answer:

4.02 km/hr

Explanation:

5 km/hr = 1.39 m/s

The swimmer's speed relative to the ground must have the same direction as line AC.

The vertical component of the velocity is:

uᵧ = us cos 45

uᵧ = √2/2 us

The horizontal component of the velocity is:

uₓ = 1.39 − us sin 45

uₓ = 1.39 − √2/2 us

Writing a proportion:

uₓ / uᵧ = 121 / 159

(1.39 − √2/2 us) / (√2/2 us) = 121 / 159

Cross multiply and solve:

159 (1.39 − √2/2 us) = 121 (√2/2 us)

220.8 − 79.5√2 us = 60.5√2 us

220.8 = 140√2 us

us = 1.115

The swimmer's speed is 1.115 m/s, or 4.02 km/hr.

Lerok [7]3 years ago
4 0
4.02 is the answer to your question
You might be interested in
A gas expands from an initial volume of 30.0 L to a final volume of 65.0 L at a constant pressure of 110kPa. How much work is do
Brilliant_brown [7]

Answer:

3850 J

Explanation:

V_{i} = initial volume of the gas = 30 L = 0.03 m³

V_{f} = final volume of the gas = 65 L = 0.065 m³

P = Constant pressure of the gas = 110 kPa = 110000 Pa

W = Work done by the gas

Since the pressure is constant, Work done by the gas is given as

W = P (V_{f} - V_{i})\\W = (110000) (0.065 - 0.03)\\W = 3850 J

8 0
4 years ago
What is the average force (average with respect to height of the barbell from the ground) exerted by the weightlifter in the pro
Novay_Z [31]

This question is incomplete, the complete question is;

A weightlifter holds a 1,300 N barbell 1 meter above the ground. One end of a 2-meter-long chain hangs from the center of the barbell. The chain has a total weight of 400 N. How much work (in J) is required to lift the barbell to a height of 2 m?

What is the average force (average with respect to height of the barbell from the ground) exerted by the weightlifter in the process?

Answer: Average force exerted by the weightlifter in the process = 1600N

Explanation:

To find Work done to lift a barbell and half of the hanging chain we say;

W₁ = ( 1300N + (1/2 × 400N)) × 1m

W₁ = (1300 + 200) Nm

W₁ = 1500J

now work done to lift the upper half of the chain we say:

W₂ = (1/2 × 400N) ×  (1/2 × 1m)

W₂ = 200N × 0.5m

W₂ = 100J

So total work done will be

W = W₁ + W₂

W = 1500J + 100J

W = 1600J

To find the average force exerted by the weight lifter, we say;

F = W/D

F = (1600 / 1m) N

F = 1600N

∴Average force = 1600N

6 0
3 years ago
Why do meandering streams form an alternating series of cut banks and point bars along their course?
Vinvika [58]

Answer:

A stream erodes the outsiders of meanders and deposits sand and gravel on the inside bends to from point bars. Both the velocity and channel depths are greatest near the outside bend and stream erode at outsides banks. In the same time sediment erodes is deposited in the slower water on the inside of the meander forming a point bar. Because the outside bank of a meander is eroded and sediment is deposited on the insde of the bend towards its outside bank. Hence in this meandering streams form an alternating series of cut banks and point bars along there course.

8 0
4 years ago
A(n) __________ is the idea that people should be able to purchase the essentials of life by working a forty-hour workweek. Many
jek_recluse [69]

Answer:

A(n)  <u>living wage</u> is the idea that people should be able to purchase the essentials of life by working a forty-hour workweek. Many local municipalities have as a result set higher minimum wages than the federally mandated minimum wage to accomplish this goal.

Explanation:

Living wage is the idea given to reduce poverty specially in cities with higher costs. It's based on the fact that one who works forty hours per week, he or she should be able to afford the basic needs of life that includes the water, food and shelter. Research has shown that the implementation of this concept has played the role in reducing poverty and enhancing the quality of life of workers. Countries like New-Zealand and united kingdom has supported this concept.

5 0
4 years ago
A person pushes a 25kg box across a horizontal frictionless surface with a force of 200 Newtons.
inna [77]
Second law of physics. F = MA
200 = 25A
I believe you are capable of doing the rest
6 0
3 years ago
Other questions:
  • State the law of refraction
    9·2 answers
  • A charge of 4.5 × 10-5 C is placed in an electric field with a strength of 2.0 × 104 . If the charge is 0.030 m from the source
    14·1 answer
  • Someone help me with this ASAP!!
    5·2 answers
  • A 235 kg crate is pulled across a horizontal surface with a force of 760 N applied at an
    11·1 answer
  • PLZZZ HELP
    11·1 answer
  • An object accelerates from rest with a constant acceleration of 5.7 m/s^2. How fast will it be traveling after it goes 80 m?​
    14·2 answers
  • PLEASEEEEE HELPP ILL DO ANYTHING
    10·1 answer
  • I need the magnitude, i will mark brainlest and please no fakes
    5·1 answer
  • Five physical properties of metals
    14·1 answer
  • A 60.0-kg skater begins a spin with an angular speed of 6.0 rad/s. By changing the position of her arms, the skater decreases he
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!