A wheel turns with a constant angular acceleration of 0.700 rad/s2rad/s2. I JUST NEED PART B , THANK YOU.
part a :
How much time does it take to reach an angular velocity of 6.00 rad/srad/s, starting from rest?
Express your answer in seconds.
Answer=8.57s
part b:
Through how many revolutions does the wheel turn in this interval?
Express your answer as a number of revolutions.
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Determine if the following forces are conservative
a.) ? = ? 2??̂+ ? 2??̂+ ????̂
b) ? = ??????̂+ ?????̂+ ???̂
c) ? = ??̂+ ??̂+ ??̂
d) ? = (3? 2?? − 3?)?̂+ (? 3 ? − 3?)?̂+ (? 3? + 2?)?̂
e) ? = −?? where a is a constant.
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A circular coil of wire with radius 4 cm and 20 turns is placed in a uniform magnetic field of magnitude 0.3 T. The magnetic field is parallel to the area vector; i.e. perpendicular to the plane of the coil.
a) What is the magnetic flux through the coil?
b) The magnetic field is decreased to 0 T in 0.1 s. What is the magnitude of the emf
induced in the coil during this time interval?
c) If the coil has a resistance per unit length of 3 Ω/m, how much current flows in the coil
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A puck with a mass m1 = 28.0 g moving at 1.00 m/s approaches a stationary puck with a mass m2 = 102 g on an air table and they undergo a two-dimensional elastic collision. As a result of their interaction, the incident puck moves away with a speed v1 = 0.785 m/s and the other puck moves away with a speed v2 in a different direction. What is the angle between the velocities v1 and v2 ?
Explain please!!!
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1. Real heat engines, like the gasoline engine in a car, always have some friction
between their moving parts, although lubricants keep the friction to a minimum. Would a
heat engine with completely frictionless parts be 100% efficient? Why or why not? Does the
answer depend on whether or not the engine runs on the Carnot cycle? Again, why or why
not?
2.Some critics of biological evolution claim that it violates the second law of thermo-
dynamics, since evolution involves simple life forms developing into more complex and more
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14. If the photon is travelling towards earth, from a region with lower gravitation, the shift will be towards a _______ in the wavelength.
a. Increase
b. Decrease
c. No change
d. None of the above
15. Gravitational waves carry energy and momentum, travel at a speed
a. Slower than that of light
b. Faster than that of light
c. Same speed of light
d. None of the above
16. Gama rays can be considered as _____
a. Wave
b. Particles
c. Both particles and waves
d. None of the above
17. By considering the electromagnetic radiations are particles, we can explain the following properties
a. Reflection
b. Refraction
c. Interference
d. Diffraction
18. In Young’s double slit experiments, the central fringe is always
a. Bright
b. Dark
c. Bright or dark depends on the length between screen and slits
d. Bright or dark depends on the length between slits
19. According to Stefan’s law total radiant heat energy emitted from a source is proportional to
a. T4
b. 1/T4
c. T2
d. 1/T2
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A spring stretches 4.0cm when a load of 20N suspended. How much will the spring stretch if 50.0N load is suspended from it and it does not reach it's elastic limit?
2. You purchase a 500g sample of gold and want to know if it is pure to see if you were cheated. You found the sample when lowered into water displaced 27.5 ml. Was the sample pure gold?
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A toy car starts from rest and accelerates on a straight road at a rate of 3m/s^2 for 5 seconds. In the next 2 seconds, it continues to move at a constant speed. Finally, it accelerates at a rate of 2m/s^2 until it stops in the rest of the rest of the time. Find its
a.) Displacement
b.) Speed at t=6 seconds
c.) plot the following graphs:
I. x vs. t
II. v vs. t
III. a vs. t
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How would astronomers use spectra A, B and C to precisely calculate how fast the star was moving? How would the speed the star is moving allow astronomers to be able to deduce information about the orbiting planet? What type of information could the astronomers calculate?
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A ray of light impinges from air onto a block of ice (n = 1.309) at a 33.0
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A small metal sphere has a mass of 0.15 g and a charge of -21.0 nC. It is 10.0 cm directly above an identical sphere that has the same charge. This lower sphere is fixed and cannot move. If the upper sphere is released, it will begin to fall.
What is the magnitude of its initial acceleration?
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An electron is accelerated through 2400 V from rest and then enters a region where there is a uniform 1.70-T magnetic field. What are (a) the maximum and (b) the minimum magnitudes of the magnetic force acting on this electron.
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You have two blocks, with respective masses of 8 kg and 12 kg sitting next to each other on a table. You decide to move them both together, and push on the 8 kg block with a net force of 120 N such that it pushes the 12 kg block along with it.
a. Find the acceleration for both blocks.
b. Will both blocks feel the same net force? Explain.
c. Draw a force diagram on the 8 kg block, and find a force equation for the horizontal forces acting on it.
d. Draw another force diagram on the 12 kg block, and find a force equation for the horizontal forces acting on it.
e. Explain how Newton's 3rd law applies to your answers in part C and D.
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Two friends, Barbara and Neil, are out rollerblading. With respect to the ground, Barbara is skating due south at a speed of 3.5 m/s. Neil is in front of her. With respect to the ground, Neil is skating due west at a speed of 3.0 m/s. Find Neil's velocity ((a) magnitude and (b) direction relative to due west, as seen by Barbara.
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