The Global Positioning System (GPS) relies on very accurate atomic clocks aboard a network of 24 satellites, each of which orbits the Earth in 12 hours To provide a resolution better than 1 meter on Earth, the clocks must not gain or lose more than 3 ns in 12 hours That is, the clocks must be accurate to 3 x 10-⁹ s/(12 hr) = 7 × 10-14 The satellites move at a speed v = 3.9 km/s in circular DO

Two automobiles are 150 kilometers apart and traveling toward each other. One automobile is moving at 35 km/h and the other is moving at 40 km/h. In how many hours will they meet? A) 2.5 h B) 2.0 h C) 1.75 h D) 1.5 h F) 1.25 h

(89) X 0 馄.all 89% 12:40 PM Homework 1 PHYs 2100-09-LAB, SPRING 2019 NAME CIN Question 1. A bird flies a distance of d- 150+3 m during a time 20.0+1.0 s The average speed of the bird is u-d/t = 7.5 m/s. what is the uncertainty of u? Question 2. Suppose that we're able to eliminate the uncertainty in our time mea- surement so that t = 20.0 ±0.0 s. What is the new uncertainty of u?

A = 2 X 1025, B = 4.5 X 10-10, C = 3 X 10-6. AB/C = ?       (2) ACB = ?       (3) The Moon is approximately 400,000 km from the Earth.  An atom of a certain element has a diameter of 4 X 10-8 cm. Given 1 km = 1,000 m and 1 m = 100 cm, about how many atoms of this element can be lined up between Earth and Moon?             (4) A spherical planet has a radius of 2,000 km and a mass of 1025 kg. Calculate its density (mass/volume) in kilograms per cubic meter.           (5) How many of the atoms in Question (3) can fit within a spherical planet with a diameter of 2 X 104 km?           (6) An asteroid’s radius is 200 m and its distance from Earth is 107 km. What angle in degrees (θ) will it subtend? Use the equation  θ = 57 (diameter) / distance

Question 1 Make the conversion of 2.4 Km/h2 to m/s2. O 6.67 E(-4) 1.85 E(-4) 1.85 E(-7) 0.67 1.5 Question 2 In solving a physics problem you end up with m in the numerator and m/s in the denom units for your answer are O m/s O m^2/s O m O 1/s Question 3

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That's what I thought too! But the answer choices it gave were 8 m/s, 4 m/s, 2 m/s, and 6 m/s so I'm confused. I went with 8 and it was wrong.

Suppose f(x,y,z) = Ax2 + Bxy + Cxyz2.   What is ▽f?

Given that the Diameter of Earth is about 7200 miles, how many Earths would fit across the Sun? You turn toward the east, seeing the full moon rising. You find that half of your finger tip at arm's length also covers the diameter of the Moon! Given that the diameter of the Moon is about 2160 miles, approximately how far from Earth is the Moon in miles and km according to your calculations?

Question 7