Ablue-light photon has a wavelength of
4.80 × 10^−7 meter. what is the energy of the
photon?
(1) 1.86 × 10^22 j (3) 4.14 × 10^−19 j
(2) 1.44 × 10^2 j (4) 3.18 × 10^−26 j

The momentum of an isolated system is conserved a) only in inelastic collisions. b) only in elastic collisions. c) in both elastic and inelastic collisions

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

3. a particle with initial velocity v⃗ 0=(5.85×103m/s)j^ enters a region of uniform electric and magnetic fields. the magnetic field in the region is b⃗ =−(1.35t)k^. you can ignore the weight of the particle. a. calculate the magnitude of the electric field in the region if the particle is to pass through undeflected, for a particle of charge +0.640 nc.