Description 1. Compare the slope of the distance vs. time graph to the average of all your velocity values. Are they close? Why or why not? What does the slope of a distance (or displacement) vs. time graph mean? Explain the answer using your data and include your Distance vs. Time graph and a chart of distance, time, and average velocity. 2. D Describe the line on the velocity-time graph. What was the slope of the velocity vs. time graph? What does the slope of a velocity vs. time graph represent? Explain the answer using your data. In doing so, compare and contrast speed and velocity. Include your velocity-time graph in your answer. 3.
Description Riddle: Write a conclusion to the following riddle. You are alone in a dank, dark room. To escape this place, you will have to have adequate light. In the room, there is a candle, a wood stove and a kerosene lamp. The candle is three inches long, made of blood-red wax, and can burn for ninety minutes. The woodstove is old, dusty, and made of iron. Only one log of wood is available for the stove, though there is plenty of kindling. The stove is difficult to light, but it will provide light for two hours. The kerosene lamp looks like it came from a Victorian railway station. The lamp is full, with a clean wick, and it will give light for a full six hours. You only have one match, so what do you light first?
Description (8 points) Score 1. During a medieval siege of a castle, the attacking army uses a trebuchet to hurl heavy stones at the castle walls. If the trebuchet launches the stones with a velocity of +30.0 m/s at an angle of 50.0°, how long does it take the stone to hit the ground? What is the maximum distance that the trebuchet can be from the castle wall to be in range? How high will the stones go? Show all your work. Answer: (8 points) Score 2. A 70.0 kg astronaut is training for accelerations that he will experience upon reentry. He is placed in a centrifuge (r = 10.0 m) and spun at a constant angular velocity of 16.3 rpm. Answer the following: a. What is the angular velocity of the centrifuge in rad/s? b. What is the linear velocity of the astronaut at the outer edge of the centrifuge? c. What is the centripetal acceleration of the astronaut at the end of the centrifuge? d. How many g’s does the astronaut experience? e. What is the centripetal force and net torque experienced by the astronaut? Give magnitudes and directions. Show your work. Answer: (9 points) Score 3. An astronaut lands on an alien planet. He places a pendulum (L = 0.200 m) on the surface and sets it in simple harmonic motion, as shown in this graph. [img width="354" height="253" src="file:///C:/Users/Spare/AppData/Local/Temp/msohtmlclip1/01/clip_image002.jpg" v:shapes="_x005F i1025"> NUMBER 1 Answer the following questions: a. What is the period and frequency of the pendulum’s motion? b. How many seconds out of phase with the displacements shown would graphs of the velocity and acceleration be? c. What is the acceleration due to gravity on the surface of the planet in m/s2? Determine the number of g-forces. Show any necessary calculations. Answer: (8 points) Score 1. Explain how Einstein’s contribution to understanding the force between the earth and the moon differed from Newton’s. Include a brief statement of Einstein’s explanation in your answer. Answer: (9 points) Score 2. Saturn has a radius of about 9.0 earth radii, and a mass 95 times the Earth’s mass. Estimate the gravitational field on the surface of Saturn compared to that on the Earth. Show your work. Answer: (9 points) Score 1. An experiment was devised to investigate the effects on the temperature of a cup of coffee when cream is added at different time intervals. Hot and cold water were used instead of coffee and cream. First, a container of water heated to 80°C was allowed to sit for 15 minutes. Its temperature was measured at regular intervals. Next, similar temperature measurements were taken for 15 minutes on a new container of heated water, but this time some cold water was added after the 2-minute reading. Finally, the procedure was repeated except that for this last test, the cold water was added after the 12-minute reading. The resulting recorded temperatures were plotted on the graph shown here. NUMBER2 Based on the information given here, answer the following questions about the experiment. · What question was asked in the experiment? · What was the hypothesis, expressed as an if-then statement? · What were the independent and dependent variables? · What was the control in the experiment? · Were there any sources of error in the experiment? If so, what? · What could you conclude from the data? Answer: (9 points) Score 2. Compare and contrast deductive reasoning and inductive reasoning. Based on the information given here, answer the following questions about the experiment: · What are the qualities of deductive reasoning? · What are the qualities of inductive reasoning? · Throughout the history of physics, when did these types of reasoning come into play? · Provide one example of a physicist who used deductive reasoning, one who used inductive reasoning, or one who used both. Answer: (7 points) Score 3. The data in Light-Duty Vehicles (1975–2006) show the efficiency of light-duty vehicles from 1975 (leftmost point of the connected line) to 2006 (rightmost point of the connected line). Each point represents a year in chronological order from the left end to the right. Data adapted from http://www.sightline.org/images/blog-2008/Mileage-horsepower-EPA-600.gif NUMBER3 Look at the graph carefully and answer the following questions: · What generalizations can you make about changes in fuel efficiency (miles per gallon, MPG) over the course of the study? · What generalizations can you make about changes in engine performance (horsepower) over the course of the study? · What generalizations can you make about changes in vehicle efficiency (horsepower multiplied by MPG) over the course of the study? Answer:
Description which force produces the smallest torque? 20.0N perpendicular to the center of rotation at a radius of 1.0 m 10.0 N perpendicular to the center of rotation at a radius of 1.5 m 20.0 N perpendicular to the center of rotation at a radius of 0.5 m 10.0 N perpendicular to the center of rotation at a radius of 0.25 m a car decelerates from 20 m/s to 10 m/s. which of the following statements is true? 1.No net torque acts on the wheels at all. 2.You cannot tell from the information given 3.A net torque acts on the wheels opposite their direction of motion 4.a net torque acts on the wheels in their direction. What is the frequency of motion of a 0.67 m long pendulum? 0.61 hz 0.43 hz 2.33 hz 1.6 hz
Description 1. Which of these was discovered by Newton? A. The earth orbits the sun, rather than the reverse B. The acceleration caused by gravity is 9.8 m/s^2 C. Gravity keeps the planets in their orbits D. The planets move in elliptical orbits around the sun 2. The force of gravity between any two ordinary objects on the earth is _______ A. Stronger than the force of gravity from the earth B. Stronger if the objects are more massive C. Stronger when closer to the earth D. Always downward 3. What is the magnitude of a gravitational field at a location where an 80 kg astronaut weighs 25 percent what he would weigh on the earth? A. 3 N/kg B. 800 N/kg C. 10 N/kg D. 7 x 10^-11 N/kg 4. How high does a rocket have to go above the earth's surface to be subject to a gravitational field from the earth that is 50.0 percent of its value at the earth's surface? A. 3,190 km B. 9,020 km C. 12,700 km D. 2,650 km 5. What causes gravitational force in Einstein's theory of general relativity? A. The way an object with mass placed on a surface bends the surface B. Reference frames moving at a constant relative velocity C The existence of black holes D. The way mass bends space and time 6. A mass of 2.50 kg is in a gravitational field of 14.0 N/kg. What force acts on the mass? A. 9.8 N B. 35.0 N C. 5.60 N D. 0.179 N 7. If you plotted vector arrows around a mass to represent gravitational field vectors, describe how the length of the arrows would change as the locations at which they are drawn become closer to the mass that produces the field. A. The arrows would become longer. B. The arrows would become shorter. C. The arrows would remain the same length D. The arrows would become shorter and reverse their direction at some distance 8. Which of the observations listed is the best evidence supporting Einstein's conception of gravity? A. The detection of black holes B. The revolution of the earth around the sun C. the rotation of the earth D. Kepler's laws 9. What is Kepler's first law of planetary motion? A. Planets have elliptical orbits. B. The period of a planet's orbit is proportional to its distance from the sun. C. Planets have circular orbits. D. The eccentricity of a planet's orbit is proportional to its distance from the sun. 10. Which of these is correct about the moon's motion around the earth? A. There is no gravity acting on the moon because it is in orbit. B. Centrifugal force acting on the moon balances the force of the earth's gravity C. The moon is in free fall D. The moon exerts no gravitational force on the earth.
Description You perform a knee extension exercise on a cable type machine during which your knee joint rotates through an angular displacement of 0.84 radians in 2.24 s. This lift is done entirely by the quadriceps muscle which shortens 0.021 m. At the beginning and end of that time the weight is motionless. That action, together with the various ratios in the machine causes a weight of 43.06 N to be lifted a total of 0.351 m. What was was the force produced by your quadriceps muscles during the lift?
Description Hi I have two things to do which the first thing, to answer the study guide questions and the second thing, to answer the Homework question. I'm going to send the study guide questions and two files that you have to use to support you to answer the study guide. First thing : Study guide question file: Exam3_Study_Guide(1)...pdf Two files to answer the study guide questions: 1) Lecture_Interference_Diffraction....ppt 2) Lecture_Color(1)....ppt Second thing : Home work questions : HW_Assignment_7....pdf questions....pdf NOTICE: please make sure to answer each thing in separate file.
Description for particles in an attractive 1/r potential show that a) if 2 orbits have the same angular momentum , the perihelion of the parabolic orbit is one half the radius of the circular orbit b) the speed of a particle at any point in a parabolic orbit is (root 2) faster than the speed of a particle in a circular orbit passing through the same point
