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
grandymaker [24]
4 years ago
14

A ball rolls around a circular track with an angular velocity of 4π rad/s. what is the period of the motion

Physics
1 answer:
BlackZzzverrR [31]4 years ago
4 0
The period, T, is the time required for one revolution.

The angular velocity is 4π rad/s.
Because one revolution = 2π radians, the period is
T = (2π rad)/(4π rad/s) = 0.05 s.

Answer: 0.5 s
You might be interested in
If a wave has a period of 0.5 s, what is its frequency
Naddik [55]
Frequency is 1/period.  f=1/0.5 = 2Hz
8 0
4 years ago
An ac generator with peak voltage 100 volts is placed across a 10-? resistor. What is the average power dissipated?
Romashka [77]
The correct answer is: Average Power  = 500 W

Explanation:
Root-mean square voltage = Vrms = Vpeak /√2 = 100 / √2 volts
Resistance = R = 10 Ω
Average power = Pavg = (Vrms)^2<span> / R </span>= (100 * 100) / (2 * 10) = <span>500 W</span>
3 0
4 years ago
Why is it safe to watch an eclipse of the Moon but not an eclipse of the Sun
gavmur [86]
A solar eclipse occurs when the moon crosses in front of the Sun, blocking some or all of its rays. A lunar eclipse happens when the moon is directly behind the earth, blocking the moon from receiving light. The only light comes from the light on earth's reflected shadow.

You can look at a lunar eclipse because there is very little light or none at all. You can't look at a solar eclipse because you are looking directly at the sun unless it is complete. Before totality, only some of the Sun is blocked, causing your pupils dilate to let in more light. Since they do this, more of the Sun's rays can be let in to the eye, which effectively allows your eyes to burn. 

Some doctors and eye care specialists say that after someone complains of blindness after looking at a solar eclipse unaided, they can see what the Sun and moon looked like at the time that they looked at it, as it is burned onto their retinas. 
8 0
4 years ago
Suppose the maximum safe average intensity of microwaves for human exposure is taken to be 2.50 W / m 2 . If a radar unit leaks
MArishka [77]

Answer:

 r = 0.56 m

Explanation:

The power emitted by the radar is evenly distributed in a sphere, so let's use the ratio of intensity and power

              I = P / A

              A = P / I

              A = 10.0 / 2.50

              A = 4 m²

Let's find the radius of the sphere of this area

          A = 4π r²

         r = √ A / 4π

         r = √ 4 / 4π

         r = 0.56 m

5 0
3 years ago
Select the correct answer.
pantera1 [17]

Answer:

Option A is correct.

The total distance is 105 kilometers, and the total displacement is 15 kilometers east.

Explanation:

  • Distance is a scalar quantity, so it doesn't have anything to do with direction.
  • Distance only adds up the magnitude. so,

                         Distance = 60 + (60-15) = 60+ 45 = 105 km

  • Displacement is a vector quantity,it should be calculated by concerning truck's direction too.
  • Considering the direction and magnitude,

                      Displacement = +60(E) -45(W) = 15 km East

                     

5 0
3 years ago
Other questions:
  • A cat of mass of 1kg runs at a speed of 2.5 m/s what is the momentum of the cat?
    5·2 answers
  • Since our number system is on a base-10 notation, we do not need to learn scientific notation.
    15·2 answers
  • A student is preparing to bake a cake at home and places several ingredients on the countertop to use. First he preheats the ove
    11·1 answer
  • The atomic number, or ________ number, is the described as the number of _________ in the nucleus of an chemical element. A) pro
    6·2 answers
  • A ball rolls down a hill and hits a box. The momentum of the ball decreases. Which happens to the momentum? Select one of the op
    5·1 answer
  • Can you please match
    6·2 answers
  • A man travels 630 km partly by car and partly by bus. It takes 12 hours in all of he travel 180 in by bus and rest by car. if he
    15·1 answer
  • What force can stop a 1400kg truck accelerating at 7.5m/s2? URGENT PLZZ
    10·2 answers
  • Plz help!!!!!!!!!!!!!!!!!
    11·2 answers
  • 2. Which process is used by plants to cycle water from the ground, through the roots, and out the leaves as water vapor?
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!