Who first arranged the elements according to atomic mass and noticed a periodic recurrence of their physical and chemical properties?

A. Henry Moseley

B. Antoine Lavoisier

C. John Dalton

D. Dmitri Mendeleev

A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 93.1 kg. The mass of the rock is 0.292 kg.

What is the magnitude and direction of an electric field that exerts a 2.00*10-5N upward force on a - 1.75μC charge?

If you throw a ball upward with an initial speed of 4m/s at 1.5m above the ground, find a. the flying time for this free fall motion, b. the final velocity just before touching the ground, and c. the maximum height with respect to the ground.

How do you make a spectroscope

How do objects with the same charge behave? a. They don't do anything different. b. They move. c. They catch on fire. d. They move apart.

What color of light can plants "see"?

Two tiny beads are 25 cm apart with no other charges or fields present. Bead A carries 10 µC of charge and bead B carries 1 µC. Which one of the following statements is true about the magnitudes of the electric forces on these beads

A ball is thrown straight up at 20 m. What is the balls velocity as it hits the ground?

Block 1 and Block 2 have the same mass, m, and are released from the top of two inclined planes of the same height making 30 degree and 60 degree angles with the horizontal direction, respectively.

Water waves change direction when they encounter water of different depths and begin to move at different wave speeds. This is called A. reflection B. constructive interference C. the Doppler effect D. refraction