Which one of the following has exactly 3 significant figures

What is a string theory?

Which statement accurately describes a similarity between Earth and Venus? A. Both planets have an atmosphere primarily composed of oxygen B. Both planets show evidence of volcanic activity C.

The device that measures current in a wire by using the deflections of an electromagnet in an external magnetic field is

Sound waves travel at the rate of 343 m/s at 20°C. If a man standing 450 meters away from the wall of a canyon yells, "Hello," how long will it take for him to hear his own voice echo off of the wall?

Compare and contrast measures of central tendency and measures of variability.

What is the density of cylindrical (coin) object if it has a mass of 0.69 kg, and a radius of 0.03 m, along with a thickness of 0.003 m?

A horse canters away from its trainer in a straight line, moving 37 m away in 9.1 s. It then turns abruptly and gallops halfway back in 1.8 s. Calculate its average speed for the entire trip. Express your answer using two significant figures.

A 13,000 N car starts at rest and rolls down a hill froma height of 10 m. It then moves across a level surfaceand collides with a light spring-loaded guardrail.

Convert 52.3 weeks into days 367.5 days 366.1 days 450 days

From the earth, the moon subtends an angle of approximately 0.5°. If the distance to the moon is approximately 240,000 miles, find an approximation for the diameter of the moon accurate to the nearest hundred miles.