The uncertainty in position of a positron in a certain state is 1 nm. the uncertainty in its momentum can be 5.0 times 10^-26 kg middot m/s 4.0 times 10^-24 kgmiddotmiddot m/s 3.0 times 10^-24 kgmiddotmiddot m/s only (b) and (c) only (a) none of the above

Imagine you are riding on a yacht in the ocean and traveling at 20 mph. you then hit a golf ball at 100 mph from the deck of the yacht. you see the ball move away from you at 100mph, while a person standing on a near by beach would observe your golf ball traveling at 120 mph (20 mph + 100 mph). now imagine you are aboard the hermes spacecraft traveling at 0.1c (1/10 the speed of light) past mars and shine a laser from the front of the ship. you would see the light traveling at c (the speed of light) away from your ship. according to einstein’s special relativity, how fast will a person on mars observe the light to be traveling? a) 0.1c (1/10 the speed of light) b) c (the speed of light) c)1.1c (c+0.1c)

Explain why electric current cannot exist if a current doesn't have a voltage source.

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87