PLEASEPLEASEPLEASE HEL what information does a ship's sonar device use to determine the distance to the ocean?
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 temperature of water near the ocean floor
d. the composition of the ocean floor and the temperature of water near the ocean floor
( i know there are two of the same answers but um that's how it was so)

Ogle–2013–blg–0723 is an exoplanet that is similar to earth in size and proximity to its star. this exoplanet has mass m=4.18×1024kg and radius r=5.66×106m. an astronaut whose weight on earth is w=735n lands on the planet. a. calculate m, the mass of the astronaut. b. calculate gp? , the acceleration due to gravity on the surface of ogle–2013–blg–0723. c. calculate wp? , the weight of the astronaut on the surface of ogle–2013–blg–0723. d. calculate v, the minimum velocity required to put an object into orbit above ogle–2013–blg–0723. e. calculate t, the time required to complete an orbit around ogle–2013–blg–0723.

The integral design hub incorporates thento the bearing unit. n a. cv joint n b. mounting carrier n c. brake rotor n d tie rod end

Which of the following changes will result in a stronger electromagnet? a. using fewer coils of wire b. using a higher voltage c. using a shorter nail d. using a longer wire