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You are driving to the grocery store at 15 m/s .You are 150 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.80 s. and that your car brakes with constant
A 430g block slides along a frictionless surface at a speed of 0.35 m/s.it runs into a horizontal massless spring with spring constant 47 N/m that extends outward from a wall. it compress the sprin
An electron (mass m = 9.11×10-31kg) is accelerated in the uniform field E (E = 1.42×104N/C) between two parallel charged plates. The separation of the plates is 1.38cm. The electron is
Given the symmetric situation of the previous problem, what is the magnitude of the force on an electron placed at point P?
A ball of mass 1.020 g and positive charge q =40.2microC is suspended on a string of negligible mass in a uniform electric field. We observe that the ball hangs at an angle of theta=15.0o from the
A research reactor, after going critical for the first time, operates at a power level of 100W for 4 hours. How much fission product activity in Ci does the reactor contain at the following times af
An airplane is flying with a velocity of 85.0 at an angle of 22.0 above the horizontal. When the plane is a distance 113 directly above a dog that is standing on level ground, a suitcase drops out
A raindrop with a radius of 1.5 mm and mass 0.014 g falls from a cloud that is at a height of 1200 m above the ground. What is its terminal speed? (Take the drag coefficient to be 0.6, and assume th
A street lamp weighs 158 N. It is supported equally by two wires that form an angle of 104 degrees with each other. What is the tension of each of these wires?
An 845-N sled is pulled a distance of 190 m. The task requires 1.70 104 J of work and is done by pulling on a rope with a force of 124 N. At what angle is the rope held?
Calculate the magnitude of the gravitational force exerted by Venus on a 80 kg human standing on the surface of Venus. (The mass of Venus is 4.91024 kg and its radius is 6.1106 m.)
You hang the rod vertically and attach a 76 kg mass to the bottom, and you observe that the bar becomes 1.44 cm longer. From these measurements, it is possible to determine the stiffness of one int
Your toaster has a power cord with a resistance of 0.017 connected in series with a 10.2 nichrome heating element. The potential difference between the terminals of the toaster is 120v how to figur
A fountain shoots a jet of water 10 m into the air. The fountain has a round nozzle of diameter 2.5 cm at ground level, fed by a pump located 3.5 m below ground through a round pipe of diameter 9.1
(a) Find the charge that appears on the positive electrode. (b) Find the charge that appears on the negative electrode. (c) Find the net charge of the entire capacitor.
An initially neutral ball bearing is hooked up to a machine that transfers electrons onto it. Afterwards, the ball bearing is analyzed and its charge is -2.81×10^-9 C. Find the mass increase
You (mass 80 kg) and your friend (mass unknown) are in a rowboat (mass 60 kg) on a calm lake. You are at the center of the boat rowing and she is at the back, 2 m from the center. You get tired and
The electric field at the point x = 5.00cm and y = 0 points in the positive x direction with a magnitude of 8.00 N/C. At the point x = 10cm and y = 0 the electric field points in the positive x dir
Long, long ago, on a planet far, far away, a physics experiment was carried out. First, a 0.250- ball with zero net charge was dropped from rest at a height of 1.00 . The ball landed 0.400 later. Ne
y is the displacement of a string particle and x is the position of the particle on the string. The wave is traveling in the +x direction. What is the speed v of the wave?
If you apply 20 N of force on a crate on a warehouse floor and the crate refuses to move, what frictional force does the floor present to the crate?
A helicopter is ascending vertically with a speed of 5.97 . At a height of 124 above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground?
The value of the Coulomb constant is 8.98755 × 109 N · m2/C2 and the charge on an electron is 1.6 × 10-19 C What is the distance between the two spheres?
A flywheel rotating at 640 rev/min is brought to rest with a uniform deceleration of 2.0 rad/s^2. How many revolutions does it make before coming to rest.