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A concave mirror has a focal length of 25.5cm. The distance between an object and its image is 46.6cm. Find (a) object and (b) image distance assuming that the object lies beyond the center of curva
A 50 ball of clay traveling east at 1.5 collides and sticks together with a 50 ball of clay traveling north at 3.0. What is the speed from the resulting ball of clay (using two significant figures)?
From what hieght did the student fall? Assume that the only force acting on him during the collision is that due to the ground.
How does the range of the projectile on the Moon compare with that of the projectile on the Earth?
A visible light photon takes 8.3 minutes to travel from the solar photosphere to the Earth. Calculate how long it would take to travel from the photosphere to Solar Probe at its closest approach dis
A car rounds a flat curved road (radius = 100 m) at a speed of 25.0 m/s and is about to slide at this speed. What is the coefficient of static friction between the tires of the car and the road?
A 500 N man is riding in an elevator. At a certain instant his feet push against the floor with a force greater than 500 N. At this instant, the elevator may be (Choose the CORRECT Answer):
A spring is hanging vertically from a ceiling. (Assume the spring's mass is negligible.) I hang a 0.5kg mass on the spring and let the spring slowly stretch to an equilibrium position. Then the spri
The wave reflects from the speeder's car and returns to the police car, where its frequency is measured to be 316 Hz less than the emitted frequency. Find the speeder's speed with respect to the gro
A baseball is thrown by the center fielder (from shoulder level) to home plate where it is caught (on the fly at an equal shoulder level) by the catcher. At what point is the ball's speed at a minim
A metal wire has a resistance of 25.00 ohms under room temperature conditions of 25 degrees celsius. When the wire is heated to 85 degrees celsius the resistance increases by 0.75 ohms. What is the
The two particles move off in separate paths, both of which lie in the plane perpendicular to B. At a later time the particles collide. Express the time from decay until collision in terms of m, B,
At what rate would electric energy be lost for each ohm of resistance in the rails?
Determine the fraction of the energy radiated by the sun in the visible region of the spectrum (350 nm to 700 nm). (Assume the sun's surface temperature is 5800 K.)
Using only these numbers together with the values of the speed of light and the electron charge, do the following. (a) Find the work function of potassium
Earth's magnetic field (60.0 µT) is directed toward the north and is inclined downward at 66° to the horizontal. Find the magnitude and direction of the magnetic force on 110 m of the cond
What magnetic field is necessary perpendicular to both the electron path and the electric field so that the electron travels in a straight line?
An alpha particle (q = +2e, m = 4.00 u) travels in a circular path of radius 4.50 cm in a uniform magnetic field with B = 1.80 T. Calculate its kinetic energy in electron-volts.
An electron is accelerated from rest by a potential difference of 350 V. It then enters a uniform magnetic field of magnitude 200 mT with its velocity perpendicular to the field. (a) Calculate the s
At some point in its orbit our asteroid is moving with a speed of 20 kilometers per second. Determine the kinetic energy of the asteroid assuming it has a mass of 1000 kilograms. Be sure your answer
If the distance from the Sun varied during our asteroid's orbit, would its kinetic energy change? Would its potential energy change? Would the total energy (sum of kinetic and potential energy) of
Neutral Particle A neutral particle is at rest in a uniform magnetic field B. At time t = 0 it decays into two charged particles, each of mass m. (a) If the charge of one of the particles is q = +20
What amount of current is needed to provide a modest force of magnitude 5 kN? Take the vertical component of Earth's field to be 10 µT and the length of the axle to be 3.0 m.
If the angular speed of the front sprocket is 0.650 rev/s, what is the radius of the rear sprocket for which the tangential speed of a point on the rim of the rear wheel will be 4.50 m/s? The rear w
Find the required angular speed rev/min of an ultra-centrifuge for the radial acceleration of a point 2.50cm from the axis to equal 400000g (that is, 400000 times the acceleration due to gravity)