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A woman stands on a scale in a moving elevator. Her mass is 53.0 kg, and the combined mass of the elevator and scale is an additional 815 kg. Starting from rest, the elevator accelerates upward. During the acceleration, the hoisting cable applies a force of 9860 N. What does the scale read during the acceleration?
N
A beam of 2-MeV neutrons is incident on a slab of heavy water (D2O). The total cross-sections of deuterium and oxygen are 2.6b and 1.6b respectively.what is the macroscopic total cross section of D2O at 2 MeV?
The mean free path of a molecule in a gas is 280 nm. What is the mean free path if the gas temperature is tripled at constant volume?What is the mean free path if the gas temperature is tripled at constant pressure?
When driving west toward the Rocky Mountains, you see a peak 2.8 degrees above the horizon. Your GPS gives your current elevation as 1500 m , and according to the map, you're 22.5 km (horizontally) from the peak. Find the peaks elevation.
A hotel elevator ascends 140 {rm m} with a maximum speed of 4.59 {rm m/s}. Its acceleration and deceleration both have the magnitude of 1.93 {rm m/s^2}. How long does it take to make complete trip from bottom to top.
From point B, the ball was in the air 2.0 seconds and traveled a horizontial distance of 16.2 meters before hitting the ground. Illustrate with what velocity did the ball leave her hand at point B?
A 0.54-kg particle has a speed of 2.0 m/s at point A and kinetic energy of 7.5 J at point B. What is its speed at point b
Consider three charged particles arranged in an equilateral triangle with sides of length d. Find the electric field vector at the triangle's center
what is the resolving power of a microscope (lamda = 550 nm) with a 5-mm-diameter objective which has focal point of= 9mm
A copper block rests 25.5cm from the center of a steel turntable. The coefficient of static friction between block and surface is 0.52. The turntable starts from rest and rotates with a constant angular acceleration of 0.475 rad/s2. After what tim..
A glass fiber with a thermal expansion coefficient of 5x10^6 C^-1, an elastic modulus of 72 GPa, Calculate the maximum flaw size that this fiber can tolerate
What is the horizontal component of the ball velocity
A 1.56m tall student stands before a vertical mirror. She can just see her whole body, from head to toe. How tall is the mirror
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