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A toy train is pushed forward and released at x_0=2.0m with a speed of 2.0m/s. It rolls at a steady speed for 2.0s, then one wheel begins to stick. The train comes to a stop 6.0m from the point at
At time t=0 a grinding wheel has an angular velocity of 22.0 rad/s. It has a constant angular acceleration of 34.0 rad/s^2 until a circuit breaker trips at time t = 1.50 s. From then on, the wheel t
Three particles are placed in a line. The left particle has a charge of -67 X 10^-6 C, the middle, 45 X 10^-6 C. Find the net force on the middle particle.
A professor's office door is 0.85 wide, 2.0 high, and 4.0 thick; has a mass of 25 ; and pivots on frictionless hinges. A "door closer" is attached to the door and the top of the door frame.
Suppose a heat engine takes in 420 J of energy from a hot reservoir and performs 30 J of work in each cycle. Find the efficiency of the engine.
Calculate the energy lost by photons Compton scattered at 45°, 90° and 135° for incident photons of energies 50 keV and 100 keV.
A 3.0-m-long rigid beam with a mass 150 {rm kg} is supported at each end. An 70 {rm kg} student stands 2.0 {rm m} from support 1. How much upward force does support 1 exert on the beam?
A volume of 60.0mL of aqueous potassium hydroxide (KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the KOH solution if 24.7mL of 1.50 M H2SO4 was nee
A jet is circling an airport control tower at a distance of 21.0 km. An observer in the tower watches the jet cross in front of the moon. As seen from the tower, the moon subtends an angle of 8.88
When rearranging a dorm room, a student does 292 J of work in moving a desk in moving a desk 3.2 m. What was the magnitude of the applied horizontal force
The driver sees a speed limit sign approaching and applies the brakes to decelerate to a speed of 48 km h-1. Given that the deceleration is 2.68 m s-1 find the distance over which the brakes are app
A man in search of his dog drives first 10 mi northeast, then 54 mi straight south, and finally 6 mi in a direction 30° north of west. What are the magnitude and direction of his resultant disp
A hoop of a radius of .5 m and mass of .2 kg is released from rest and allowed to roll down an inclined plane. how fast is it moving after dropping through a vertical distance of 3m.
Lead pellets, each of mass 1.20 g, are heated to 200°C. How many pellets must be added to 450 g of water that is initially at 20.0°C to make the equilibrium temperature 25.0°C? Neglect a
A model rocket rises with constant acceleration to a height of 3.7 , at which point its speed is 25.0 What was the magnitude of the rocket's acceleration?
A gymnast is performing a floor routine. In a tumbling run she spins through the air, increasing her angular velocity from 3.00 to 4.60 rev/s while rotating through three-fourths of a revolution. H
Assuming that no energy is lost by heat to the surroundings, determine the total entropy change of the horseshoe-plus-water system.
Nitric acid is usually purchased in concentrated form with a 70.3% HNO3 concentration by mass and a density of 1.14% g/ml. How much of the concentrated stock solution in milliliters should you use t
A 535 g ball swings in a vertical circle at the end of a 1.4 m-long string. When the ball is at the bottom of the circle, the tension in the string is 22 N. What is the speed of the ball at that poi
Sulfuric acid is a very strong inorganic used in commercial and non-commercial laboratories. What is the molarity of a 70.00 wt % solution of sulfuric acid in water? The density of
To determine if the ball clears the cross-bar, what is its height with respect to the crossbar when it reaches the plane of the crossbar?
A child of mass 25kg stands at a distance of 1m from the axle. The child then proceeds to walk toward the edge of the merry go round. What is the new angular speed of the system when the child reach
On July 15, 2004, NASA launched the Aura spacecraft to study the earth's climate and atmosphere. How many hours does it take this satellite to make one orbit?
A 250.0ml sample of air at 100.0 K is warmed to 200.0 K at constant pressure.What is the volume of the air sample at the new temperature .
A 5 m wide dam holds back a 6 m deep lake with only air on the other side. What is the net force on the dam?