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If the two buckets are pulled upward with an acceleration of 1.80 m/s2 by the upper cord, calculate the tension in each cord.
You throw a ball, m=2kg, with an initial velocity of 20 m/s at an angle of 60 degrees from the top of a 30m cliff. a) Using energy considerations, what is the magnitude of the velocity when it hits
A 12.0 V battery is in series with a switch, a 0.30 H inductor, and a 19 Ω resistor. A). What's the time constant τ? I calculated τ to be 0.016 s or 16 ms which came back correct. It i
After being released, the block hits a rough surface with a coefficient of friction of 0.6. How far does the block travel across the rough surface before it comes to a stop?
Bruce places a 2.0kg block over a small hole on a table. He then puts a gun under the table and shoots a 35.0g bullet into the block where it lodges. If the block rises1.3m above the table, how fast
a) What is the velocity of the block after it leaves the spring but before it gets to the incline? b) How far up the incline (along the hypotenuse of the triangle) does the block travel?
An archer puts a 0.30-kg arrow to the bowstring. An average force of 201 N is exerted to draw the string back 1.3 m. Assuming that all the energy goes into the arrow, with what speed does the arrow
A proton has an initial speed of 4.9 x 105 m/s. (a) What potential difference is required to bring the proton to rest?
A boxer receives a horizontal blow to the head that topples him over. The force, of magnitude 1.35 x 103 N, is applied for 1.7 x 10-2 s at a point 1.67 m above the floor. The boxer has a moment of ine
A hair dryer has a power rating of 12000w at 120v rms. assume that the hair dryer is the only resistance in the circuit. What is the resistance of the heating element?
A 1.83kg book is placed on a flat desk. Suppose the coefficient of the static friction between the book and the desk is 0.442 and the coefficient of kinetic friction is 0.240. How much force is need
The drawing shows two situations in which charges are placed on the x and y axes. They are all located at the same distance of 6.4 cm from the origin O. For each of the situations in the drawing, de
What is the angular magnification when the image formed by the lens is at the near point of the eye (25 cm)?
The total charge on the conducting spherical shell is -Q. (Assume the potential is zero very far from all charges. Use a, b, c, k, and Q as necessary.)(a) What is the electric potential of the spher
A cube of material is placed with one corner at the origin of a coordinate system; its sides, 1vm long a re parallel to the three axes. The current density is Ai+Bj+Ck throughout the cube. The units
If I drop a 0.2kg ball from a height of 2 m onto the floor, and It bounces back to a height of 1.6m. How much energy did it lose in the collision with the floor and to air resistance?
The brakes of a truck cause it to slow down by applying a retarding force of 3.40 103 N to the truck over a distance of 920 m. What is the magnitude of the work done by this force on the truck? Is t
A uniform electric field with a magnitude of 6270 N/C points in the positive x direction. Find the change in electric potential energy when a +12.5 µC charge is moved 5.16 cm in the following
A 0.40 kg mass attached to the end of a string swings in a vertical circle of radius 1.8 m. At an instant when the string makes and angle of 40 degrees below the horizontal the speed of the mass is
A 200 g object tied to a string 80 cm long travels in a vertical circle of radius 80 cm. At the top of the circle the speed of the object is 4.5 m/s. What is the tension in the string at this positi
First draw the system with the x-y plane as the page you are drawing on and the y-axis as the vertical axis. Make the downward direction the positive y-direction and the positive x-direction to the
A block of mass 5.0 kg is pulled across a horizontal surface at a constant speed by a force 14 N directed at 35 degrees from the horizontal. What is the coefficient of kinetic friction between the
A distant galaxy emits light that has a wavelength of 479.2 nm. On earth, the wavelength of this light is measured to be 481.6 nm. Find the speed of the galaxy relative to the earth. (Give your answ
Objects with masses of 200 kg and 500 kg are separated by 0.400 m. (a) Find the net gravitational force exerted by these objects on a 50.0 kg object placed midway between them.