Andrew B.

A wire with resistance R is connected to the terminals of a 30 V battery. What is the potential difference Δ𝑉ends between the ends of the wire? What is the current I through the wire, if the wire... more

Please Help with Question 2 and can you double check my work 1 a-e. didn’t quite understand this lesson so please help me draw the diagrams 🙏🙏 even if you just draw one and explain how to do it in... more

A lidless box is to be made using 2 m2 of cardboard. Find the dimensions of the box with the largest possible volume.A lidless cardboard box is to be made with a volume of 4 m3. Find the dimensions... more

Riders in an amusement park ride shaped like a Viking ship hung from a large pivot that is rotated back and forth like a rigid pendulum. Sometime near the middle of the ride, the ship is near... more

A sinusoidal wave on a string travelling in the -x direction has an amplitude of 1cm, wavelength 3cm and frequency 245 Hz. At t=0, the particle of string at x=0 is displaced by the distance... more

a) Find the amount of energy involved in this entire process, in J. b) Find the amount of energy involved only in evaporating the water when it is at 100 °C, in J. c) Find the amount of energy... more

An ore sample weighs 17.5N in air. When the sample is suspended by a light cord and totally immersed in water, the tension in the cord is 11.2N. How do I find the total volume and the density of... more

A 5 kg block of lead (c = 128 J/(kg °C)) is at rest on a spring with a constant of 150 N/m. A 2 kg block of lead is thrown on top of the 5 kg block from a height of 2.40m above the block and an... more

A banked curve makes it safer to drive on curved roads even if it seems more dangerous. The following is a 1200kg car on a banked curve at 20 degrees from the horizontal. However, the car is... more

Solid objects do not vibrate. (That we can see and/or feel and/or hear.) However, molecules inside a solid vibrate. Does this mean the solid structure or object itself vibrates or just the... more

Two small conducting spheres attached to very thin silk filaments hang from a very large metal beam. The silk attached to sphere 1 is dry and therefore nonconducting, while the silk attached to... more

The figure above represents a glass lens that has one flat surface and one curved surface. After incoming parallel rays pass through the lens, the rays pass through a focal point. The focal length... more

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Please help.I found this interesting problem on the internet, but I don't know how to start it:These are the questions:At what frequency do astronauts hear the hum?What frequency should the radio... more