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What is the magnitude of the (net) force of the floor on the beam? What is the minimum value the coefficient of static friction between beam and floor can have in order for the beam not to slip at th
Friction prevents the rod from sliding off the supports. Find the normal force exerted on the rod by the lower support. The acceleration of gravity is 9.81 m/s2 . Answer in units of N.
Two aluminum rods A and B are such that rod A has twice the length of rod B when they are at the same temperature. They are heated such that rod B experiences twice as great an increase in temperat
You travel in a spacecraft with a speed of 0.2 c. Your atomic watch (light clock) tells it takes 1 year to reach your space station from the earth. What do you see the time spent from a light clock
A test charge of -5.0 X 10-7 C is placed between two other charges so that it is 50 mm from a charge of -3.0 X 10-7 C and 10 cm from a charge of -6.0 X 10-7 C. The three charges lie along a strai
What is the magnitude and direction of the net electrostatic force acting on the charge at the center?
What are (a) the magnitude and (b) the angle of the vector A + B + C, and (c) the magnitude and (d) the angle of A-B+C? What are the (e) magnitude and (f) angle of the fourth vector D such that (A+B
A transverse wave on a string has an amplitude A. A tiny spot on the string is colored red. As one cycle of the wave passes by, what is the total distance traveled by the red spot?
A pressurized container holds 3 kg of steel immersed in 2 L of water. The pressure inside the container is 300 kPa and the Temperature 23C. What is the combined volume of the water and steel?
A bar of gold (bar A) is in thermal contact with a bar of iron (bar B) of the same length and area. One end of the compound bar is maintained at Th = 76.5°C while the opposite end is at 30.0&de
If one micrometeorite (a sphere with a diameter on the order of 2.3 x 10-6 m) struck each square meter of the Moon each second, estimate the number of years it would take to cover the Moon with micro
An electron, trapped in a one-dimensional infinite potential well 170 pm wide, is in its ground state. How much energy must it absorb if it is to jump up to the state with n = 4?
State how much energy is transferred in each of the following cases: a. 2 grams of steam at 100 degrees Celsius condenses to water at 100 b. 2 grams of boiling water at 100 degrees Celsius cools to ic
A solid conducting sphere of radius 2.00 cm has a charge of 8.60 µC. A conducting spherical shell of inner radius 4.00 cm and outer radius 5.00 cm is concentric with the solid sphere and has a
A 50N force is applied to a wire with a radius of 1mm. The wire was 0.7m long, but is now 0.75m long. what is the young's modulus for the material the wire is made of?
The screen is now moved 2.4 m further away. What is the new distance between the central and the second-order bright fringe?
A 1.10 balloon is filled with helium gas until it becomes a 23.0 -diameter sphere. What maximum mass can be tied to the balloon (with a massless string) without the balloon sinking to the floor?
(a) Find the x and y components of the net momentum of this system. (b) What are the magnitude and direction of the net momentum?
Find the net electric field (magnitude and direction) at x = 0 cm. (Use the sign of your answer to indicate the direction along the x-axis.)
Assume that a lift force acting perpendicular to the wings acts on the aircraft as it moves through the air. What is the radius of the circle in which the plane is flying?
Calculate the diameter of a disk 10 centimeners thick required to store 1 megajoule of energy, if this disk is rotating about an axis perpendicular to the disk with 90 rotations per minute. It is m
The area of a typical eardrum is about 5.00 x 10-5 m2. (a) calculate the average sound power incident on an eardrum at the threshold of pain, which corresponds to an intensity of 1.00 W/m2. (b) How
Assume the man requires a time interval of (?t) to respond to the warning. How close to the sidewalk can the flowerpot fall before it is too late for a warning shouted from the balcony to reach the
Nitrogen gas in an expandable container is cooled from 50.0°C to 10.0°C with the pressure held constant at 3.00 x 105 Pa. The total heat liberated by the gas is 2.50 x 104 J. Assume that the g
A fire hose exerts a force on the person holding it. This is because the water accelerates as it goes from the hose through the nozzle. How much force is required to hold a 6.9cm-diameter hose deliv