Thermodynamics: light bulb

A light bulb has a filament of metal that has an emissivity of 0.3 and a surface area of 5.0 x 10^-5 m^2. It is heated to 2500 degrees Celsius in an environment with a temperature of 25 degrees Celsius. What is the power dissipated through radiation by the filament?

Thermodynamics: Heat engine

A heat engine (thermodynamic cycle) with a fixed amount of working gas is shown in diagram. If the gas temperature at point 3 is 400 K, then how many moles of gas are in the engine? What is the temperature at point 2? Is process stroke 2,3 a heat intake or cooling stroke? How much work is done by process stroke 2,3? How much net work is produced for the whole cycle?

Nitrogen balloon

A round balloon had a radius of 0.30 m & contains nitrogen (N2) at 30 degrees Celsius and one atmosphere total pressure. What is the volume of the nitrogen in the balloon? How many moles of nitrogen are in the balloon? What is the mass of the nitrogen in the balloon? If the balloon is then submerged in a body of fresh water to a depth of 25 meters where the water temperature is 7 degrees Celsius, what is the volume of the nitrogen in the balloon at the depth of 25 meters? No files attached.

general physics prob need within a hour

1. [SJ3 7.P.004.] A particle of mass 0.450 kg is shot from P as shown in Figure P7.4. The particle has an initial velocity v0 with a horizontal component of 30.0 m/s. The particle rises to a maximum height of h = 24.0 m above P. Figure P7.4. (a) Using conservation of energy, determine the vertical component of v0. m/s upward (b) Determine the work done by the gravitational force on the particle during its motion from P to B. (Assume that h2 = 58.0 m.) J (c) Determine the horizontal and the vertical components of the velocity vector when the particle reaches B. vertical component m/s (downward) horizontal component m/s (to the right)

need help before 1 hour

6. [SJ3 7.P.024.] A toy cannon uses a spring to project a 5.30 g soft rubber ball. The spring is originally compressed by 5.00 cm and has a force constant of 7.80 N/m. When it is fired, the ball moves 16.0 cm through the horizontal barrel of the cannon, and a constant frictional force of 0.0320 N exists between barrel and ball. (a) With what speed does the projectile leave the barrel of the cannon? m/s (b) At what point does the ball have maximum speed? cm (from the starting position) (c) What is this maximum speed? m/s [SJ3 7.P.050.] A 1.50 kg object slides to the right on a surface having a coefficient of kinetic friction µk = 0.250 (Fig. P7.50). The object has a speed of vi = 3... click for more