A car of weight 1000 N is parked on a slope inclined at an angle of 20° Draw a scale diagram to work out the component of weight perpendicular
to the slope.
Choices: 940N, 60N, 1000N, 340N

What is the internal energy of 4.00 mol of diatomic nitrogen gas n2 at 455k

Modern physics a photon emitted from an excited hydrogen atom has an energy of 3.02 electron volts. which electron energy-level transition would produce this photon? a. n=1 to n=6 b. n=2 to n=6 c. n=6 to n=1 d. n=6 to n=2 i chose b but the correct answer is d can someone tell me why? and what's the difference?

Física: un futbolista patea hacia el arco con una velocidad de 15m/ah, calcular: a)el alcance para un ángulo de tiro de 25º, b) el tiempo que el balón permanece en el aire.