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Sunspots vary in number as a function of time, exhibiting an approximately 11 year cycle. Galileo made the first European observations of sunspots in 1610, and daily observations were begun in Zurich in 1749. At the present time we are well into the 23rd observed cycle. What is the frequency of the sunspot cycle? Give your answer in Hz.
A cubical box is filled with sand and weighs 798 N. We wish to "roll" the box by pushing horizontally on one of the upper edges. What minimum coefficient of static friction between box and floor is required
Two identical point charges are fixed to diagonally oppositecorners of a square that is 2.8 m on aside. Each charge is +3.5 µC. How much work is done by the electricforce as one of the charges moves to an empty corner?
At t = 0, an automobile travelling north begins to make a turn. It follows one-quarter of the arc of a circle of radius 10.70 m until, at t = 1.60s, it is travelling east. The car does not alter its speed all through the turn.
1500 cm3 of ideal gas at STP is cooled to -20o C and put into a 1000 cm3 container. what is the final gauge pressure?
A tank having a volume of 0.100 m3 contains helium gas at 135 atm. How many balloons can the tank blow up
A potter's wheel is rotating at 3.2 rad/s in a counterclockwise direction when the potter turns it off and lets it slow to a stop. This takes 26 seconds. What is the average angular acceleration of the wheel during this time?
A tube 1.16 m long is closed at one end. A stretched wire is placed near the open end. The wire is 0.355 m long and has a mass of 8.80 g. Find the tension in the wire
Suppose he enters the water at a speed of 16.0 m/s via path 1. Explain how fast is he moving on path 2 when he releases the rope at a height of 4.00 m above the water? Ignore the effects of air resistance.
An electron on from the sun enters the earth's magnetic field high above its surface and undergoes a cicular motion. Calculate the raduis of the circle
When resting, a person has a metabolic rate of about 6.16 x 105 joules per hour. The person is submerged neck-deep into a tub containing 2.51 x 103 kg of water at 24.3 °C. If the heat from the person goes only into the water, find the water temper..
You are on an airplane traveling 30° south of due west at 100.0 m/s with respect to the air. What is the heading of the plane with respect to the ground
A 11 kg box must be slid across the floor. what is the minimum force needed to start the box moving from rest
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