Matter is made up of tiny particles which can be atoms, molecules, or electrically charged particles called?.

These four photos show features of earth that change with time, some fast and some slow. which of these features could not exist if earth did not have a magnetic field?

A hot air ballon with a mass of 500kg ascends at a constant rate of 1.5 m/s for 20s. how much work is done by the upward force?

Particles at the very outer edge of Saturn's A Ring are in a 7:6 orbital resonance with the moon Janus. If the orbital period of Janus is 16 hours 41 minutes, what is the orbital period of the outer edge of Ring A?

Is the answer system

Thermodynamics 1st law

A 0.065-kg tennis ball moving to the right with a speed of 15 m/s is struck by a tennis racket, causing it to move to the left with a speed of 15 m/s. if the ball remains in contact with the racquet for 0.

Which of the following are thought to be rapidly rotating neutron stars with intense magnetic fields? Choose one answer. a. pulsarsb. white dwarfsc. black holesd. flare starse. accretion disks

Which of the following can be a centripetal force? a. friction c. tension b. gravity d. all of the above

A man with a mass of 60 kg walks up two flights of stairs in going from the first floor to the third floor (10 meters). Calculate his increase in potential energy

At a certain harbor, the tides cause the ocean surface to rise and fall a distance d (from highest level to lowest level) in simple harmonic motion, with a period of 12.4 h. how long does it take for the water to fall a distance 0.