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Find its spring constant. The load and the spring are taken down. Two people pull in opposite directions on the ends of the spring, each with a force of 185 N. Find the length of the spring in this
Assume you pay $0.10 per kW-hour for electricity. How much would it cost just to keep the hot water inside the heater for one week? The Joules are 6.87 *10^12.
How much energy is lost through the walls of the hot water heater in one week? (Assume thinner surface of the heater is 90 C and the outer surface is 27 C.)
What is the value of the acceleration of gravity at that altitude as a percentage of the acceleration at the surface of the earth?
Calculate the activity of Uranium-238 in 100 grams of uranium ore containing 5 weight percent U308. What is the expected activity of Uranium-234 in the ore?
Question: Calculate the change in the amount of bremsstrahlung that would be produced if an aluminum target were substituted for an iron target. Please show your work. Please show your work.
Question: What percentage of a photon beam would interact in passing through a 3-mm slice of absorber if the linear attenuation coefficient were 0.15/cm? Please show your work.
Question: How many "average" collisions with hydrogen nuclei would a 1 MeV neutron need to undergo before it becomes a "slow" neutron?
Calculate the pCi of K-40 per gram of human body mass. Assume the human body is 0.2% potassium, by weight, the isotopic abundance of K-40 is 0.0117% in natural potassium, and the gram-molecular wei
A hospital needs 1 millicurie of a radioactive pharmaceutical with a half-life of 12 hours. If delivery time takes 3 days, what activity must be shipped to the hospital by the supplier? How many mi
A 1.0 x 10-9 C charge is at the origin, and a -1.00 x 10-9 C charge is 4.1 m to the right on the positive x-axis. The electric potential is -1.4 V at a point on the x-axis that is a distance d to th
In 1910 Rutherford performed a classic experiment in which he directed a beam of alpha particles at a thin gold foil. He unexpectedly observed a few of the particles scattered almost directly backwa
An electron is initially at rest just outside a large copper surface that has a charge density of 1.04 x 10-6 C/m2. How far has the electron moved in 1.12 x 10-9 s if the field is uniform over this re
The combined mass of the girl and the sled is 56.0 kg, and the coefficient of kinetic friction between the snow and the runners of the sled is 0.106. How much time is required for the sled to travel
A thin gold ring of radius 1.02 cm carries a uniform charge per unit length of 1.02e-14 C/m. Find the electric field on the axis of the ring 1.09 cm from the center.
The left section of the wire makes an angle of 14.2° relative to the horizontal and sustains a tension of 476 N. Find the (a) magnitude and (b) direction (as an angle relative to horizontal) of
A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 88.8 m/s2 for 1.58 seconds, at which point its fuel abruptly runs out. Air resis
A 2.70-kg ball, moving to the right at a velocity of +3.39 m/s on a frictionless table, collides head-on with a stationary 7.10-kg ball. Find the final velocities
One object is at rest, and another is moving. The two collide in a one-dimensional, completely inelastic collision. In other words, they stick together after the collision and move off with a common
A golf ball strikes a hard, smooth floor at an angle of 22.1 ° and, as the drawing shows, rebounds at the same angle. The mass of the ball is 0.0342 kg, and its speed is 47.5 m/s just before and
The cheetah is one of the fastest accelerating animals, for it can go from rest to 32.3 m/s in 3.52 s. If its mass is 120 kg, determine the average power developed by the cheetah during the accelera
Carbohydrates, explain the fact that glucose,galactose and frutose are isomers please help me am stranded i will appreciate
When the toaster reaches its final operating temperature, the current has dropped to 1.53 A. (a) Find the power the toaster converts when it is at its operating temperature.
The Earth has a mass of 5.98 1024 kg. The average mass of the atoms that make up the Earth is about 40 u. Based on this average mass, how many atoms are in the Earth? ________ atoms