A balloon is climbing vertically upwards with a constant velocity of 4.2ms". A sandbag is dropped from the balloon and hits the ground 3.6 seconds later.
Calculate or find:

a) Velocity of the sandbag as it hits the ground.

b) Height of the sandbag at the instant that it is dropped.

What is the order of the moon, earth, and sun in a lunar eclipse and a solar eclipse?

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=