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Name some recent educational innovations and evaluate their effectiveness. Do you think that schools would be more effective if they did not have comply with bureaucratic redtape? For example, if schools did not need approval to purchase the latest technology.
A closed box is filled with dry ice at a temperature of -80.4 oC, while the outside temperature is 20.8 oC. Find the thermal conductivity of the material from which the box is made
A fancy sports car passes Big Ben at a speed of 0.2 c. What time interval will the driver measure for a one-second interval on the large clock
Consult to explore a model for solving this problem. A person pushes on a 60-kg refrigerator with a horizontal force of -250 N; the minus sign indicates that the force points in the -x direction. The coefficient of static friction is 0.66. If the ..
A disk has a moment of inertia of (3.0E-4) kg.m^2 and rotates with an angular speed of 3.5 rad/sec. What net torque must be applied to bring it to rest within 3s
Consider a stack of paper 3.0 meters high. each sheet of paper is the stack has a thickness of 0.01 centimeter
in a region of space there is an electric field e that is in the z-direction and that has magnitude e 747 ncmx. find
An apparatus similar to the one used in the oscillation part of this experiment. What is the spring constant of this spring? What is the uncertainty in the spring constant found above?
M1 is a spherical mass (43.0 kg) at the origin. M2 is also a spherical mass (17.2 kg) and is located on the x-axis at x = 99.0 m. At what value of x would a 16.5-kg mass experience no net gravitational force due to M1 and M2?
A gas with initial conditions (P,V,T)i expands isothermally until the final volume=1.986 times the initial volume. What is the ratio of the final pressure to the initial pressure
A person walks into a room that has two flat mirrors on opposite walls. The mirrors produce multiple images of the person. Consider only the images formed in the mirror on the left.
A bicycle wheel rotates uniformly through 2.0 revolutions in 4.0 s. What is the frequency of the wheel's revolution
A 24 liter tank is stored in a 15 degree C room. Its gauge reads 280 psi. A 50 liter tank is stored in a 34 degree C room. Its gauge reads 425 psi
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