In a cathode ray tube, the electrons are produced: (a). By applying an electric field to y-plates
(b). Gamma rays
(c). From fluorescent material
(d). By heating a cathode

Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)

What would people living along the coast in south florida do if there was a hurricane warning? move to locations away from the water flock along coasts to watch the natural phenomenon buy instruments to predict the exact location of the hurricane measure water levels to know the exact time of the hurricane

Which of the following statements accurately describes the sign of the work done on the box by the force of the push? a. positive b. negative c. zero