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
Vera_Pavlovna [14]
3 years ago
14

A 7.0kg skydiver is descending with a constant velocity

Physics
1 answer:
Pavel [41]3 years ago
4 0

Answer:

Air resistance: 68.6 N

Explanation:

For the skydiver falling down, there are two forces acting on him:

- The force of gravity, of magnitude

W=mg

where

m = 7.0 kg is the mass of the skydiver

g=9.8 m/s^2 is the acceleration of gravity

This force acts in the downward direction

- The air resistance, R, in the upward direction

So the net force on the skydiver is:

\sum F=mg-R

According to Newton's second law of motion, the net force is also equal to mass times acceleration:

\sum F=ma

However, in this problem the skydiver is falling at constant velocity, so his acceleration is zero:

a=0

Therefore, the net force is zero:

\sum F=0

And so we can find the magnitude of the air resistance, which is equal to the weigth of the skydiver:

mg-R=0\\R=mg=(7.0)(9.8)=68.6 N

You might be interested in
A rocket burns fuel as it shoots into the sky. What happens to the mass and volume of the rocket?
diamong [38]

Answer:

mass goes down volume remains the same

6 0
2 years ago
The record for the highest speed achieved in alaboratory for a
Ira Lisetskai [31]

Answer:

0.000234 seconds

Explanation:

Since the row is 0.15m, its radius of rotation must be 0.15 / 2 = 0.075 m

We can start by calculating the angular speed of the rod:

\omega = \frac{v}{r} = \frac{2010}{0.075} = 26800 rad/s

Since one revolution equals to 2π rad. The speed in revolution per second must be

26800 / 2π = 4265 revolution/s

The number of seconds per revolution, or period, is the inverse:

1/4265 = 0.000234 seconds

3 0
3 years ago
The product of voltage times amperage is known as what? amperes current resistance power
UNO [17]

The product of (voltage) times (current, in Amperes) is POWER.

5 0
3 years ago
Read 2 more answers
A baseball pitcher throws a ball at 97.0 mi/h in the horizontal direction. How far does the ball fall vertically by the time it
mario62 [17]

Answer:

Explanation:

1 mile=5280 ft

1 hour=3600 seconds

Changing speed from mi/h to ft/s

97 mi/h \times \frac {5280}{3600}=142.2666667 ft/s\approx 142.27 ft/s

Time of flight, t=\frac {distance}{speed}=\frac {60.5}{142.27}=0.425257732 s\approx 0.425 s

From fundamental kinematics equations

h=0.5gt^{2} where g is acceleration due to gravity whose value is taken as 32.2 ft/s2 and h is the distance

By substitution

h=0.5\times 32.2\times 0.425^{2}=2.9080625 m\approx 2.91 m

7 0
3 years ago
A rod extending between x = 0 and x = 13.0 cm has uniform cross-sectional area A = 8.00 cm2. Its density increases steadily betw
mezya [45]

Answer:

The mass is  m  = 3.45408 kg

Explanation:

From the question we are told that

    The extension  of the rod is from , \   x_1 = 0 \to x_2 = 13.0

     The area is  A =  8.0 cm^2

      The density increase as follows from  \  \rho_1 =2.5 g/cm^2 \to  \rho_2= 19.0 g/cm^3

    The equation  \rho =  B + Cx

at  x_1= 0  \rho_1 =2.5 g/cm^2

So

      2.5  =  B  + 0

=>  B =2.5

    So at x_2 = 13.0 ,  \rho_2= 19.0 g/cm^3

So

            19.0 = 2.5 + C(13)

       =>   C = 1.27

Now  

       m  =  8   \int\limits^{13}_{0} {2.5 + 1.27x} \, dx

      m  =  8   [{2.5 +\frac{ 1.27x^2}{2} } ]\left  | 13} \atop {0}} \right.

      m  =  8   [{2.5 +\frac{ 1.27(13)^2}{2} } ]

      m  = 3454.08 g

        m  = 3.45408 kg

         

8 0
3 years ago
Other questions:
  • 1. The thin top layer of the crust is called the Crust. What are the two types of
    7·2 answers
  • 3. A student determined the Kf of t-butyl alcohol using tap water instead of distilled or deionized water. Describe the problems
    8·2 answers
  • An object is thrown directly downward from the top of a very tall building. The speed of the object just as it is released is 17
    8·1 answer
  • An experiment that produces waves on a string is analyzed, and the experimental value for the wave speed is found to be 66 m/s.
    16·2 answers
  • A dripping water faucet steadily releases drops 1.0 s apart. As these drops fall, does the distance between them increase, decre
    13·1 answer
  • Homework help?
    13·2 answers
  • A closely wound rectangular coil of 75.0 turns has dimensions of 22.0 cm by 45.0 cm . The plane of the coil is rotated from a po
    6·1 answer
  • What is the portion of an electric circuit that is being powered​
    8·1 answer
  • When a person holds a ball above earth's surface, where is this potential energy stored?​
    7·1 answer
  • X-Rays contradict to?<br> a)beta b) alpha.<br> C) gamma
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!