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What are some macroeconomic factors for childhood obesity?
A thin spherical shell has a radius R=3 m. A constant force F=2 N is applied to the shell, always tangential to the surface of the sphere, producing an angular speed ?=2 rad/s about an axis through the center of the shell after a time t=4 s. What is ..
An electron is accelerated by a constant electric field of magnitude 325 N/C. (a) Find the acceleration of the electron. m/s2 (b) Use the equations of motion with constant acceleration to find the electron's speed after 9.00 10-9 s, assuming it st..
An artillery shell is fired with an initial velocity of 300 m/s at62.0° above the horizontal. Toclear an avalanche, it explodes on a mountainside 41.5 s after firing. What are the x andy coordinates of the shell where it explodes, relative toits firi..
What is the maximum magnetic field of this wave? (c = 3.0 × 108 m/s)
1) Given the equation x = 0.5 cos (0.75 π t), what is the amplitude of the wave? 2)Given the equation x = 0.5 cos (0.68 π t), what is the angular frequency of the wave? (Give the numeric value to 3 sig. fig.)
Joe is pulling an old wooden crate filled with rocks along the floor with a force of 342 Newton's and the velocity is constant. It is in what we call dynamic equilibrium. Draw a picture of the crate and show and label the directions of the four fo..
two 1.0 kg masses are 2.0 m apart on a frictionless table. each has 1.0 uc of charge.1. what is the magnitude of the
Consider the central peak in the diffraction envelope in the figure below. Suppose the wavelength of the light is changed to 450 nm. What happens to this central peak?
At the low point in it swing, a pendulum bob with a mass of 0.46 kg has a velocity of 2.2 m/s. What is its kinetic energy at the low point
A 65.0 kg person jumps from rest off a 3.19 m-high tower straight down into the water. Determine the magnitude of the average force that the water exerts on the diver
The interaction of a typical car’s tires with the road (i.e. the “grip” of the tires) can provide a “lateral” acceleration (i.e. perpendicular to the direction the car is moving) of approximately 0.8 g’s (Some sports cars can get close to 1.0 g).
A spring with a spring constant k of 32 N/m is stretched a distance of 22 cm (0.22 m) from its original unstretched position. What is the increase in potential energy of the spring
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