Straighterline PHY250 General Physics I Graded Exam 3 (New Version June 2024)

Question 1 Correct 6.00 points out of 6.00 The main pipe coming into a factory is 8 m in diameter, and the water in that pipe enters the building at 1 m / s. Once inside, however, the pipe divides into four pipes that are each4 m in diameter. Which of the following is the velocity of the water in the smaller pipes? Select one: a. 2 m / s b. 4 m / s c. 0.25 m / s d. The velocity in the smaller pipes is the same as the velocity in the larger pipe. Question 2 Correct 6.00 points out of 6.00 Recently it was discovered that a planet with mass 1.3 × 1028 kg orbits the star 70 Virginis, which is 59 light years from the Earth. 70 Virginis has approximately the same mass as the Sun, at 1.9 × 1030 kg. If the planet is in a nearly circular orbit of radius 7.1 × 1010 m what is the period of the planet in terms of Earth-days? Select one: a. 58 days b. 122 days c. 1200 days d. 1480 days Straighterline PHY250 General Physics I Graded Exam 3 (New Version June 2024) We are a team of experts offering class attendance for all Straighterline, Online ATI, HESI, NCLEX, Portage Learning, Sophia etc courses (including final proctored exams!!). We also write essays, discussion posts, research papers and school assignments. Should you need any of these services, Contact us via email: or : +1 (540) 753-5914. Guaranteed Passing! PHY250_TW | Chapter 9: Relativity Started on State Finished Completed on Time taken 51 mins 45 secs Grade 144.00 out of 150.00 (96%)Question 4 Correct 6.00 points out of 6.00 The reference frames A and A′ describe events with unprimed coordinates (x, y) and primed coordinates (x′, y′ ), respectively. Relative to A, A′ moves at a constant speed v in the direction of negative y. If the origins of the two frames coincide at the instant t = 0, which of the following equations correctly relates the coordinates y and y′ ? Select one: a. y′ = y b. y′ = y − vt c. y′ = y + vt d. y′ = yvt Tricia’s giant jack-in-the-box, Jerry, has now come to life, and wants revenge on her. While Tricia is away, Jerry devises a hydraulic press under Tricia’s bed. The press allows Jerry to apply 20 times the force on Tricia’s bed that he applies to the piston on his side. What is the ratio of the area of the piston on Jerry’s side to the area of the piston under the bed? Select one: a. 1 20 b. 20 c. 20ρgh d. 1 20ρgh Question 3 Correct 6.00 points out of 6.00Question 6 Correct 6.00 points out of 6.00 Two inertial observers are moving with relative speed v. An observer, O, measures the speed of an object in her reference frame to be u and notes O’s speed to be v. What is the speed of the object in the prime inertial frame according to O ? Select one: a. u ′ = b. u′ = c. u ′ = d. u′ = u−v 1+uv/c2 u−v 1−uv/c2 u+v 1−uv/c2 u+v 1+uv/c2 The radius of the Moon is known to be 1.7 × 106 m. Astronauts who walked on the Moon measured the time it takes an object to fall 1 m on the Moon to be about 1.1 s. Using this information, which of the following is the mass of the Moon? Select one: a. 7.1 × 1022 kg b. 3.5 × 1022 kg c. 8.5 × 1021 kg d. Not enough information is provided to solve the problem. Question 5 Correct 6.00 points out of 6.00Question 8 Incorrect 0.00 points out of 6.00 In your frame, a person is moving in the positive x-direction at a speed of 40,000 km / s. Suppose that a streetlamp located at x = 4 km turns on just as the person passes it by. The proper time interval between when the person is located at x = 0 km and when the streetlamp turns on is . Select one: a. 0.0001 s b. 0.0004 s c. 4 km d. none of the above O observes O ′ move to the right with velocity v. O ′ measures the coordinates, (x ′, t ′ ), of an event. What are the Lorentz transformations that will enable the observer in O ′ to calculate the coordinates of the same event in the O reference frame? Select one: a. x = (x′ + vt′) and t = γ(t ′ + ′ vx c2 ) b. x = γ(x ′ − vt′) and t = γ(t ′ − ′ ) vx c2 c. x = γ(x′ + vt′) and t = γ(t ′ + ′ ) vx c2 d. x = γ(x′ + vt′) and t = γ(t′ − vx′) c2 Question 7 Correct 6.00 points out of 6.00Question 10 Correct 6.00 points out of 6.00 The distance along both the axes, as shown in the drawing below, are in meters. Which of the following is the resultant gravitational force vector acting on the 100 kg mass at the origin of the diagram? Select one: a. 1.3 × 10−3 N at + 85∘ b. 1.3 × 10−3 N at − 85∘ c. 1.1 × 10−4 N at + 85∘ d. 1.1 × 10−4 N at − 85∘ The derivation of Bernoulli’s equation relies on . Select one: a. conservation of momentum b. conservation of energy c. conservation of angular momentum d. incompressibility Question 9 Correct 6.00 points out of 6.00Question 12 Correct 6.00 points out of 6.00 Why are water towers used? Select one: a. to provide cities with a clean water supply in case of a flood b. to provide cities with a water resevoir in case of a drought c. to provide a ρgh pressure difference enabling running water d. to lower the density of water, so people don’t have to drink “heavy” water Question 13 Correct 6.00 points out of 6.00 In your frame, a certain galaxy is moving at a high speed in the x-direction. Relative to the galaxy, a certain comet in the galaxy is also moving at a high speed in the x-direction. Let a be the galaxy’s speed with respect to you, b be the comet’s speed with respect to the galaxy, and c be the comet’s speed with respect to you. Then Select one: a. a + b > c b. a + b < c c. a + b = c d. a 2 + b 2 = c 2 A very fast train is moving at close to the speed of light. Suppose that its length in the frame of the ground is one-half of its length when at rest. What is the speed of the train? Select one: a. 0.87 c b. 0.50 c c. 2.0 c d. 0.75 c Question 11 Correct 6.00 points out of 6.00Question 15 Correct 6.00 points out of 6.00 A small airplane and a hot air balloon are moving horizontally towards each other. Relative to the ground, the plane travels at a speed of 135 m / s and the balloon travels at a speed of 7 m / s. Suppose that someone throws a tomato out of the basket of the hot air balloon, as shown. At a particular instant, the tomato is traveling horizontally with a speed of 28 m / s relative to the balloon. According to Galilean (or classical) relativity, what is the velocity of the tomato relative to the airplane? Select one: a. 156 m / s b. 114 m / s c. 100 m / s d. 170 m / s Which one of the following statements concerning the derivation or usage of Bernoulli’s equation is false? Select one: a. The fluid must be nonviscous. b. Streamline flow is assumed. c. The fluid must be incompressible. d. Vertical distances are always measured relative to the lowest point within the fluid. Question 14 Correct 6.00 points out of 6.00Question 17 Correct 6.00 points out of 6.00 A lift force is exerted on an airplane wing as a result of . Select one: a. Bernoulli’s principle b. Archimedes’ principle c. Poiseuille’s principle d. Pascal’s principle Question 18 Correct 6.00 points out of 6.00 When an asteriod that is headed directly for Earth is a distance of 8 Earth radii from Earth’s center, it has a speed of 15 km / s. What is the speed of the asteroid when it collides with the Earth? Ignore any frictional effects of the atmosphere. The mass of the Earth is 5.98 × 1024 kg and the Earth’s radius is 6.37 × 106 m. Select one: a. 110,000 km / s b. 10.5 km / s c. 330,000 km / s d. 18.3 km / s Suppose two inertial observers are each moving with the speed of light in the opposite directions. What is their relative speed? Select one: a. c b. 2c c. 0 d. The relative speed cannot be determined from the given information. Question 16 Correct 6.00 points out of 6.00Question 20 Correct 6.00 points out of 6.00 When viewed from above, a particular car has an area A1. Each of its four tires holds a pressure, PT , and contacts the ground with an area of A2. If atmospheric pressure is Patm, which of the following is the correct expression for the weight of the car? Select one: a. PT A2 − ρgh b. PT A2 − PatmA1 c. ρA1gh d. 4PT A2 An object is observed from two different inertial frames, S and S′. According to classical relativity, which one of the following quantities must have the same value in each frame? Select one: a. velocity b. acceleration c. momentum d. kinetic energy Question 19 Correct 6.00 points out of 6.00Question 22 Correct 6.00 points out of 6.00 Which of the following is the gravitational force between the Earth and the Moon? The Earth's mass is 6 × 1024kg the Moon's mass is 7.4 × 1022 kg and the distance between their centers of mass is 3.8 × 108 m. Select one: a. 2.6 × 1021 N b. 2.1 × 1020 N c. 7.5 × 1024 N d. 7.8 × 1028 N A 3000 kg satellite is in a circular orbit around the Earth. The radius of the orbit is r0. Using the energy diagram, what is the value of r0? The mass of the Earth is 6 × 1024 kg. Select one: a. 7.8 × 103 m b. 6.0 × 103 m c. 7.8 × 107 m d. 6.0 × 107 m Question 21 Correct 6.00 points out of 6.00Question 24 Correct 6.00 points out of 6.00 Which of the following is the resultant gravitational force acting on the 100 kg mass in the diagram? Select one: a. 7.4 × 10−7 N b. 8.2 × 10−7 N c. 1.56 × 10−6 N d. 15.6 × 10−6 N Question 25 Correct 6.00 points out of 6.00 Evaluate the following statement as true or false. Kepler’s first law of planetary motion states that the Sun is at the center of a planet’s elliptical orbit. Select one: a. false b. true A tire is filled at a gas station to the recommended pressure of 35 psi. Which of the following statements is most probable? Select one: a. The pressure inside the tire balances atmospheric pressure. b. The weight of the car is 140 N. c. The gauge pressure of the tire is zero. d. The pressure of the tire is 2.4 × 105 Pa. Question 23 Correct 6.00 points out of 6.00© 2023 StraighterLine. All rights reserved Quiz navigation 1 2 3 4 5 6 7 8 9 10 Show one page at a time Finish review