What information does a ship's sonar device use to determine the distance to the ocean floor? A. The speed of sound in water and the time it takes for a signal to return.

B. The temperature of the water and the temperature of the air above it.
C. The composition of the ocean floor and the water temperature near the ocean floor.
D. The mass of the ship and the volume of water displaced by the ship.

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.

Boxing gloves are padded to lessen the force of a blow. (a) calculate the force exerted by a boxing glove on an opponent’s face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (c) discuss the magnitude of the force with glove on. does it seem high enough to cause damage even though it is lower than the force with no glove?