Pulse-width modulation is a technique that allows a microcontroller to control the speed of motors, brightness of LEDs, or average voltage without needing a DAC.
If you don't have a microcontroller with on-board PWM hardware, or have run out of PWM channels, how can PWM be simulated using software?
An object is accelerated at a constant 70m/s/s from the ground through a height of 2m. What is the object's maximum height, time to maximum height, velocity upon hitting the ground, and total time in the air?
An object experiences an acceleration of -4m/s/s for a period of 2.5s, after which the object has a velocity of 0m/s. What is the object's initial velocity and how far does it travel during the acceleration?
An object 2m above the ground has an initial vertical velocity of 15m/s. How long does it take to reach maximum height, and what is the maximum height? What is its velocity when it hits the ground? What is its total time in the air?
A process in a factory requires molten metal be dropped from a height and remain in freefall long enough to harden before impact. If the time needed to harden is 4s, how high must the molten metal be dropped from? What is the metal's velocity when it hits the factory floor?
A hockey puck is moving over the ice at 8m/s when it hits a rough patch of ice 5m in width. The puck continues on smooth ice at 6m/s. What was the puck's acceleration through the patch of rough ice? How long was it moving through the rough ice patch?
If an aircraft's velocity is 300m/s when the pilot increases the throttles to 100%, what is its acceleration if the final velocity is 400m/s and the distance covered is 4km? How long did it take for the aircraft's velocity to increase 100m/s?
Suppose the plates of a capacitor are separated by 1.7cm and are oppositely charged. A proton is released on the surface of the positively charged plate and collides with the negatively charged plate 1.57us later. What is the strength of the electric field, and what is the proton's velocity when it hits the negatively charged plate?
How can we use the light emitted by an object to figure out the composition of said object? We can do so by splitting light emitted by the object into its constituent components, then by comparing the results to "fingerprints" of chemical elements. This is called spectroscopy.
Suppose there is a container with a piston that can be moved to increase or decrease the container's volume. Inside this container is a gas at a pressure of 1,500,000Pa and temperature of 200C. The initial volume within the container is 0.025m^3. The piston is moved out of the container until the pressure is 950,000Pa. What is the final volume of the container?
Just one thing I noticed with many conversations about the de-platforming of Alex Jones/#InfoWars. There seems to be confusion, and in some cases purposeful ignorance/stupidity/deception, regarding the difference between the term "public" when used to mean a government, and "public" when used to describe a company.
Suppose a bag is filled with a gas until the bag's volume reaches 22.4L. The temperature and pressure of the gas within the bag remain constant at 20C and 1atm respectively. How much gas has been introduced into the bag by the time its volume has reached 22.4L?
Created 12 months ago.
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