A spherical balloon of volume 4.00 x 10 - 3 m contains helium at a pressure

of 1.20 x105 Pa. How many moles of helium are in the balloon if the average

kinetic energy of the helium atoms is 3.60 x 10-22 J?

A sound wave has a wavelength of 0.450 meters. If its speed in cold air is 330 meters/second, what is the wave's frequency?

Consider the electronic elements that are cooled by forced convection in Problem 6.31. The cooling system is designed and tested at sea level (p ≈ 1 atm), but the circuit board is sold to a customer in Mexico City, with an elevation of 2250 m and

What is defined by " one object's motion as compared to an object in a fixed position"?

A 0.97 V potential difference is maintained across a 1 m length of tungsten wire that has a cross-sectional area of 0.86 mm2. What is the current in the wire? The resistivity of the tungsten is 5.6 * 10-8 Ω · m. Answer in units of A.

Calculate the average speed (in km/hr) of Charlie whonruns to the store 4 km away in 30 minutes

No work is done on an object when a force acting on the object does not move it. True False

wavelength of a light whose second-order dark band forms a diffraction angle of 15.0° when it passes through a diffraction grating that has 250.0 lines per mm

If a fully loaded shopping cart has a head-on collision with an empty cart both moving at the same speed toward each other, which cart experiences the greater force? The greater impulse? The greater change in momentum? The greater acceleration?

Why didn't early Portuguese and Dutch explorers decide to create settlements in Australia

How do the electrons in the bulb's filament, far from the battery and its emf, "know" that they should flow?