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Question1
Prairie Dogs live in underground burrows with at least two entrances. One entrance is higher above ground and open to a stream of air when a breeze blows from any direction. A second entrance at ground level is open to almost stagnant air. How does this construction create airflow during the burrow?
Question2
Heather and Jerry are standing on a bridge 55m above a river. Heather throws a rock straight down with a speed of 15 m/s. Jerry, at exactly the same instant of time, throws a rock straight up with the same speed. Overlook air resistance. How much time elapses between first splash and second splash?
Question3
As you sit in your parked car, you glance in convex side mirror with radius of curvature R = -125cm and notice a jogger approaching. If the jogger is running at a speed of 2.50m/s, how fast is her image moving as she is 10m away?
Suppose that a small incandescent light bulb (R=2.88 kilo ohms) is connected to a standard European household AC electrical socket, Find the average power dissipated by the light bulb
A 56kg skier starts from rest at the top of a 1200-m long trail which drops a total of 230.00 m from top to bottom. At the bottom, skier is moving 11m/s. How much energy was dissipated by friction?
What is the direction of this velocity. What is the magnitude of the velocity.
A 300 kg piano slides 4.50 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40.
A 76 kg student traveling in a car with a constant velocity has a kinetic energy of 1.1 multiply.gif 104 J. What is the speedometer reading of the car in km/h
At 100 °C the rms speed of nitrogen molecules is 576 m/s. Estimate the rate of molecular collisions (collisions/s) on this wall
A 75-kg piece of metal has specific heat 430 J/kg°C and is initially at 950°C. To cool it down, it is dunked into 710 kg of oil that has a temperature of 32°C and specific heat of 2700 J/kg°C. Assuming that heat flows only between the oil and the m..
Tritium with a half-life of 12.3 years is used to verify the age of expensive brandies. how many years ago was it produced
Mercury has a mass of 3.30 1023 kg and a radius of 2.44 106 m. Assume it is a uniform solid sphere. What is the rotational kinetic energy of Mercury on its axis
A ladder of mass 30 kg and length 5m leans against a frictionless wall. The angle between the ladder and the wall is 37 degree. what is the force between the ladder and the wall
Imagine that we add 250 J of thermal energy to 1 liter (L)(1000cm^3) of air initially at room temperature and normal pressure. By how much does its pressure increase
An elderly sailor is shipwrecked on a desert island but manages to save his eyeglasses. How far apart are the lenses when the telescope is adjusted for minimum eyestrain
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