17.a. Explain the fundamental forces of nature. b. A SONAR (sound navigation and ranging) used ultrasonic waves to detect and locate objects

underwater. In a submarine equipped with a SONAR, the time delay between the generation of a probe wave

and the reception of its echo after reflection from an enemy submarine is found to be 77.0 s. What is the

distance of the enemy submarine? (Speed of sound in water = 1450 m s-1)

( urgently need this answer)​

Matt is driving down 7th street. he drives 150 meters in 18 seconds. assuming he does not speed up or slow down, what is his speed?

Agas is contained in a vertical, frictionless piston–cylinder device. the piston has a mass of 3.2 kg and a cross-sectional area of 35 cm2. a compressed spring above the piston exerts a force of 190 n on the piston. if the atmospheric pressure is 95 kpa, determine the pressure inside the cylinder.

Thomas his older brothers, who own a junk yard, on the weekends to earn extra money. he likes to them push broken-down cars to the back of the junk yard because it makes him feel strong. last saturday, they pushed three cars with different weights, and he noticed he used different amounts of force for each one. the cars were the following weights: white car: 2,700 kg red car: 1,500 kg blue car: 2,100 kg think about how much force is needed to move each car. which correctly lists the cars in order from the most to least amount of force needed to move them? a) white, blue, red b) blue, red, white c) red, white, blue d) white, red, blue