i am having trouble with part b. i understand how to find hisvelocity for part a. for part b i am having trouble finding theacceleration and i am having trouble finding the average forceexerted on his torso. how do i go about answering part b?for part bi need the answer in 2 significant figures . for the equation F=mahow is that the average force exerted on his torso?

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Irving HeathcoteLv2

23 Jun 2019

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The figure is an edge-on view of a 14 cm diameter circular loop rotating in a uniform 3.8×10^-2 T magnetic field. I solved part a by using

φ= B A cos θ = Bπr² cosθ = (3.8 x 10^-2) π (.07)2cos (0 degrees)= 5.8 x 10^-4 Wb and got correct answer,

but having trouble finding the right answer for part B. I used the same equation for part B and used cos (30)= got the wrong answer. Is there another equation for finding the answer with the other angles?

Part A What is the magnetic flux through the loop when is 0 degrees?

Express your answer to two significant figures and include the appropriate units.
=5.8×10⁻⁴ Wb
Correct

Part B What is the magnetic flux through the loop when is 30 degrees?
Express your answer to two significant figures and include the appropriate units.
=

Part C
What is the magnetic flux through the loop when is 60 degrees?
Express your answer to two significant figures and include the appropriate units.
=

Part D What is the magnetic flux through the loop when is 90 degrees?
Express your answer to two significant figures and include the appropriate units

graysardine234

A 2.16-kg object on a frictionless horizontal track is attached tothe end of a horizontal spring whose force constant is 5.00 N/m.The object is displaced 3.28 m to the right from its equilibriumposition and then released, initiating simple harmonicmotion.
(a) What is the magnitude of the force acting on the object 3.50 safter it is released?
(b) How many times does the object oscillate in 3.50 s? (Do notround your response to an integer.)

for part a, I have already tried finding angular frequency (i got1.52145 rad/sec) and using that to find x using the equationx=Acos(wt). for x, i got 3.2658m. I then used hookes law F=-kx(k=5, x=3.2658) to find the force (i got 16.329 every time). i dontknow what i am doing wrong, can anyone help me?

Solar Sail

A solar sail allows a spacecraft to use radiation pressure for propulsion, similar to the way wind propels a sailboat. The sails of such spacecraft are made out of enormous reflecting panels. The area of the panels is maximized to catch the largest number of incident photons, thus maximizing the momentum transfer from the incident radiation.

For such spacecraft to work, the force from the radiation pressure exerted by the photons must be greater than the gravitational attraction to the star emitting the photons. The critical parameter is the area density (mass per unit area) of the sail.

Part A

Consider a perfectly reflecting mirror oriented so that solar radiation of intensity is incident upon, and perpendicular to, the reflective surface of the mirror. If the mirror has a surface area, what is the magnitude of the average force due to the radiation pressure of the sunlight on the mirror?

Express your answer in terms of the intensity, the mirror's surface area, and the speed of light.

ANSWER:

(2IA)/c
Correct

To solve the second part of this problem you will need to know the following: