Physics

Help with Physics Kinematics problem. Will Choose a Best Answer

You buy a plastic dart gun, and being a clever physics student you decide to do a quick calculation to find its maximum horizontal range. You shoot the gun straight up, and it takes 4.0 s for the dart

What's the observed wavelength for a red hydrogen line

Whats the observed wavelength for a red hydrogen line (rest wavelength equals 656nm) coming from a star moving at 30,000 km per s (3x104 km per s) Away from the Earth?-Lets do this using both the non

Conservation of Mechanical Energy Question!

Two masses are connected by a light string that goes over a light, frictionless pulley, as shown in the figure. The 8.5-kg mass m1 is released and falls through a vertical distance of h = 1.83 m befor

What is the expression for the voltage across a capacitor as it is discharging in a simple RC circuit

What is the expression for the voltage across a capacitor as it is discharging in a simple RC circuit? (Use the following as necessary: V0 for the initial voltage, R for the resistor, C for the capaci

Average speed problem

Q: A person walks first at a constant speed of 5.00 m/s along a straight line from point A to point B and then back along the same like from point B to point A at a constant speed of 3.00 m/s. What is

Can there be a color we havent discovered

Im just curious, can there be a color out there we have not discovered? Reasons that make me believe there is not is because i cant imagine a completely different color. But this raises a question fo

Model rocket is launched straight up with an inital speed

A model rocket is launched straight upward with an initial speed of 47.9 m/s. It acceler- ates with a constant upward acceleration of 2.40 m/s2 until its engines stop at an altitude of 190 m. What is

In a long uniform current carrying solenoid

is Flux Density at the end 2 times lesser than that of the center?-Yes, thats true for a long solenoid (length = twice the diameter or more).

Main Difference between Bohr and quantum..

What is the basic difference between the Bohr model of the atom and the quantum model? Thank-you!-The Bohr model places the electrons in fixed orbits. A quantum model has the electrons as a cloud lik

Electrical circuits question

a 4 ampere current runs through the heating element of a kettle. the voltage supplied to the kettle is 240 volts. what is the resistance of the heating element? step by step process please :)-Use Ohm

If the same amount of heat was provided to the same mass of aluminum, brass, copper, and steel..which metal wo

If the same amount of heat was provided to the same mass of aluminum, brass, copper, and steel..which metal would have the highest temperature?Why? Which would have the lowest? Thanks!-specific heat o

Really difficult physics questions

At the edge of a tall building roof, a prankster throws a water balloon straight upward, with his arm outstretched so when it comes down it wont hit him or the building, but will fall to the street be

Physics word problem (challenge problem!)

To determine the height of a model airplane caught in a tree, an arrow is shot vertically upward next to it. The arrow passes the plane on the way up at .95 s after being shot upward, and at 1.60 s af

Energy stored in a capacitor

A 3uF cap is charged by a 12V battery.It is disconnected from the battery and then connected to an uncharged 5uF cap.Determine the total stored energy (a) before the two capacitors are connected and (

Am I able to find the initial velocity using only gravity and height

This is part of a longer problem, but I must first find the initial velocity. A ball is thrown into the air with a max height of 20.4 m. How do you find the initial velocity without a given time? My