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
horsena [70]
3 years ago
13

On an ice rink, two skaters of equal mass grab hands and spin in a mutual circle once every 2.3 s . if we assume their arms are

each 0.85 m long and their individual masses are 65.0 kg , how hard are they pulling on one another
Physics
2 answers:
MA_775_DIABLO [31]3 years ago
8 0

Time taken to complete on complete circle = 2.3 seconds

Radius of circle (r) = 0.85 (length of each arm)

Speed of skaters = \frac{Distance}{time}

Speed = \frac{2\pi r}{t}

Speed = \frac{2 \times 3.14 \times 0.85}{2.3}

Speed (v) = 2.32 m/s

Let the force applied by one skater on the other be F

F(net) = centripetal force

F = \frac{mv^2}{r}

F = \frac{65 \times 2.32^2}{0.85}

F = 411.59 Newtons

Hence, the force applied by each skater on the other is: F = 411.59 Newtons

sashaice [31]3 years ago
6 0
We have to
 m = 65 kg
 r = 0.85 m
 t = 2.3 s
 The perimeter of the circle is given by:
 P = 2 * pi * r
 P = 2 * pi * (0.85 m)
 P = 5.34 m
 Then, by definition, the distance equals the speed by time:
 d = v * t
 v = d / t
 v = (5.34 m) / (2.3 s)
 v = 2.32 m / s
 Then, to find the radial acceleration, we must use the speed found and the radius of the circle:
 a = v ^ 2 / r
 a = (2.32 m / s) ^ 2 / (0.85 m)
 a = (5.38 m ^ 2 / s ^ 2) / (0.85 m)
 a = 6.32 m / s ^ 2
 Finally, we have that by definition the force is equal to the mass by acceleration:
 F = m * a
 F = (65 kg) * (6.32 m / s ^ 2)
 F = 410.8 N
 answer
 F = 410.8 N
You might be interested in
A vase of flowers is stationary on a table. which of the following statements best explains why the vase is stationary?
goldenfox [79]
D. The table pushes up on the vase with the same amount of force as gravity pulling it down.
7 0
2 years ago
If the mess of an object______, the weight of an object will _______
Gnom [1K]

Answer:

the same

Explanation:

7 0
2 years ago
A hot (70°C) lump of metal has a mass of 250 g and a specific heat of 0.25 cal/g⋅°C. John drops the metal into a 500-g calorimet
Gnom [1K]

Answer:

d. 37 °C

Explanation:

m_{m} = mass of lump of metal = 250 g

c_{m} = specific heat of lump of metal  = 0.25 cal/g°C

T_{mi} = Initial temperature of lump of metal = 70 °C

m_{w} = mass of water = 75 g

c_{w} = specific heat of water = 1 cal/g°C

T_{wi} = Initial temperature of water = 20 °C

m_{c} = mass of calorimeter  = 500 g

c_{c} = specific heat of calorimeter = 0.10 cal/g°C

T_{ci} = Initial temperature of calorimeter = 20 °C

T_{f} = Final equilibrium temperature

Using conservation of heat

Heat lost by lump of metal = heat gained by water + heat gained by calorimeter

m_{m} c_{m} (T_{mi} - T_{f}) = m_{w} c_{w} (T_{f} - T_{wi}) +  m_{c} c_{c} (T_{f} - T_{ci}) \\(250) (0.25) (70 - T_{f} ) = (75) (1) (T_{f} - 20) + (500) (0.10) (T_{f} - 20)\\T_{f} = 37 C

6 0
3 years ago
A 49 N coconut is in a 15 m tree. What is te potential energy of the coconut?
eduard

Answer:

735 J

Explanation:

From the question given above, the following data were obtained:

Weight (W) = 49 N

Height (h) = 15 m

Potential energy =?

Potential energy is simply defined as the product of weight of the object and height to which the object is raised. Mathematically, it is expressed as:

Potential energy = weight × height

With the above formula, we can obtain the potential energy of the coconut as follow:

Weight (W) = 49 N

Height (h) = 15 m

Potential energy =?

Potential energy = weight × height

Potential energy = 49 × 15

Potential energy = 735 J

Thus, the potential energy of the coconut is 735 J

4 0
2 years ago
An ideal gas occupies 0.4 m3 at an absolute pressure of 500 kPa. What is the absolute pressure if the volume changes to 0.9 m3 a
sveticcg [70]

Answer:

<h2>2.22 kPa</h2>

Explanation:

The new volume can be found by using the formula for Boyle's law which is

P_1V_1 = P_2V_2

Since we are finding the new volume

V_2 =  \frac{P_1V_1}{P_2}  \\

From the question we have

V_2 =  \frac{0.4 \times 500000}{0.9}   =  \frac{200000}{0.9} \\  = 222222.2222... \\  = 222222

We have the final answer as

<h3>2.22 kPa</h3>

Hope this helps you

5 0
2 years ago
Other questions:
  • A heat engine accepts 200,000 Btu of heat from a source at 1500 R and rejects 100,000 Btu of heat to a sink at 600 R. Calculate
    13·1 answer
  • What's the difference between here and there?
    7·2 answers
  • Need help with number 1
    14·2 answers
  • Scientists aboard the International Space Station are threatened by a 2.8 kg meteor hurtling toward them at 5.4 x 103 m/s. They
    15·1 answer
  • Does a compressed spring transfer elastic energy to its surroundings?
    12·1 answer
  • Set the radius to 2.0 m and the velocity to 1.0 m/s. Keeping the radius the same, record the magnitude of centripetal accelerati
    13·1 answer
  • Differentiate between s-block and p-block​
    9·2 answers
  • DESPERATE!! WILL GIVE BARINLIST AND THANKS
    9·2 answers
  • View the graph of sun hours in a city.
    10·1 answer
  • Why is friction useful between your feet and the ground?
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!