A grinding wheel is in the form of a uniform solid disk of radius 6.96 cm and mass 2.05 kg. It starts from rest and accelerates uniformly under the action of the constant torque of 0.606 N · m that the motor exerts on the wheel.

(a) How long does the wheel take to reach its final operating speed of 1 190 rev/min?
  s

(b) Through how many revolutions does it turn while accelerating?
rev

If you know the mass of a star and an object

A stone is thrown with an initial velocity of 35.0 m/s at an angle of 37 degrees above the horizontal. Find: (a) its horizontal and vertical displacement after 0.55 s; (b) its velocity after 0.55 s (both magnitude and direction). (c) its maximum height and range.

The speed of a plane in the absence of wind is 500 km/hr. In the presence of a wind, in order to fly due north at a speed of 450 km/hr with respect to the ground, the pilot must point the plane in a direction 35^o east of due north. Which of the following vectors (in unit vector notation) describes the velocity of the wind with respect to the ground?

How are standing waves similar to beats and how are they different?

Typing only, no handwriting

The charges and coordinates of two charged particles held fixed in the xy plane are: q1=6.40 μC, x1=-8.100 cm, y1=5.600 cm, and q2=6.00 μC, x2=-4.652 cm, y2=10.013 cm, Find the magnitude and direction of the electrostatic force on q2. 1.1010×102 N 5.2000×101 deg You are correct. Your receipt no. is 157-5132 Help: Receipt Previous Tries What are the x and y coordinates of a third charge q3=3.80 μC, if the net electrostatic force on q2 is zero?

What must the charge (sign and magnitude) of a 1.43-g particle be for it to remain stationary when placed in a downward-directed electric field of magnitude 690 N/C ?

What is the magnitude of an electric field in which the electric force on a proton is equal in magnitude to its weight?

A stone is dropped into a well. The splash is heard 2.2 seconds later. What is the depth of the well to the nearest tenth of a meter?

1) You have a gyroscope and a string. Wind the string up and pull it fast to get the gyroscope spinning quickly. Try to turn the gyroscope upside down quickly. How does it feel different compared with doing the same thing when the gyroscope is not spinning? Finally, when it has slowed down a little (but not stopped) repeat the experiment. Does it feel the same when you try to flip the gyroscope at high speed versus low speed? Explain the physics of what is happening.

If 47.0 cm of copper wire (diameter = 1.00 mm) is formed into a circular loop and placed perpendicular to a uniform magnetic field that is increasing at a constant rate of 10.5mT/s, at what rate is thermal energy generated in the loop?

_______________ W

A block is at rest on an inclined plane whose elevation can be varied. The coefficient of static friction is μ_s= 0.45, and the coefficient of kinetic friction is μ_k = 0.18. The angle of elevation θ is increased slowly from the horizontal.

At what value of θ does the block begin to slide (in degrees)?

What is the acceleration of the block?

1. Kepler’s 3rd law.

(a) In an otherwise empty universe, two rocks of 5 kg orbit each other at a distance of 1m. What is their orbital period?

(b) The period of the Martian moon Phobos is 0.3189 d and the radius of the orbit is 9370 km. What is the mass of Mars?

When an oscillator is underdamped, there are two principle effects that we observe as a result (compared to the undamped oscillator). Describe them and explain why they occur?