PHY 265 Exam 1 | Questions with Verified Answers

PHY 265 Exam 1 | Questions with Verified Answers What is the Physics Primer? a. A tutorial of the most important physics concepts covered in introductory physics courses. b. A detailed explanation of all of the mathem ...

PHY 265 Exam 1 | Questions with Verified Answers What is the Physics Primer? a. A tutorial of the most important physics concepts covered in introductory physics courses. b. A detailed explanation of all of the mathematics you will use in your introductory physics course. c. A list of the most important formulas used in introductory physics courses. d. A set of mathematics topics that are relevant to introductory physics courses. Determine the values of m and n when the following mass of the Earth is written in scientific notation: 5,970,000,000,000,000,000,000,000 kg m, n = 5.97, 24 Determine the values of m and n when the following average distance from the Sun to the Earth is written in scientific notation: 150,000,000,000 mm. m,n = 1.5, 11 Determine the values of m and n when the following charge of a proton is written in scientific notation: 0.000000000000000000160 C. m,n = 1.60, -19 Determine the values of m and n when the following average magnetic field strength of the Earth is written in scientific notation: 0.0000451 T m, n = 4.51, -5 The mass of a high speed train is 4.5×105 kg, and it is traveling forward at a velocity of 8.3×101 m/s. Given that momentum equals mass times velocity, determine the values of mm and n when the momentum of the train (in kg⋅m/s) is written in scientific notation. m,n = 3.7,7 Given that average speed is distance traveled divided by time, determine the values of m and n when the time it takes a beam of light to get from the Sun to the Earth (in s) is written in scientific notation. Note: the speed of light is approximately 3.0×108 m/s. m,n = 5.0, 2 In an experiment you are performing, your lab partner has measured the distance a cart has traveled: 28.4inch. You need the distance in units of centimeter and you know the unit equality 1inch=2.54centimeter. By which conversion factor will you multiply 28.4inch in order to perform the unit conversion? a. 2.54 centimeter/ 1 inch b. 2.54 inch / 1 centimeter c. 1 inch / 2.54 centimeter d. 1 centimeter/ 2.54 inch You would like to know whether silicon will float in mercury and you know that can determine this based on their densities. Unfortunately, you have the density of mercury in units of kilogram/meter^3 and the density of silicon in other units: 2.33 gram/ centimeter^3. You decide to convert the density of silicon into units of kilogram/ meter^3 to perform the comparison. By which combination of conversion factors will you multiply 2.33 gram/ centimeter^3 to perform the unit conversion? 1 kilogram/ 10^3 gram × 1 centimeter/ 10^−2meter × 1 centimeter/ 10^−2 meter × 1 centimeter 10^−2 meter You have negotiated with the Omicronians for a base on the planet Omicron Persei 7. The architects working with you to plan the base need to know the acceleration of a freely falling object at the surface of the planet in order to adequately design the structures. The Omicronians have told you that the value is gOP7=7.29gOP7=7.29 flurg grom^2, but your architects use the units meter second^2, and from your previous experience you know that both the Omicronians and your architects are terrible at unit conversion. Thus, it's up to you to do the unit conversion. Fortunately, you know the unit equality relationships: 5.24 flurg = 1 meter and 1 grom = 0.493 second. What is the value of gOP7 in the units your architects will use, in meter/second^2? gOP7 = 5.72 meter/ second^2 A student solving for the acceleration of an object has applied appropriate physics principles and obtained the expression a = a1 + F/m where a1=3.00 meter/second2, F=12.0 kilogram⋅meter/second2 and m=7.00 kilogram. First, which of the following is the correct step for obtaining a common denominator for the two fractions in the expression in solving for a? a= (m/m⋅a1/1)+(1/1⋅F/m) Next, based on the correct answer from Part A, which of the following is the correct symbolic expression for a? a= ma1+F/m Finally, what is the numerical value of aa? a = 4.71 meter/ second^2 A student solving a physics problem for the velocity of an object has applied appropriate physics principles and obtained the expression v= d/t − v0, where d= 35.0 meter d=35.0 meter, t=9.00 second, and v0=3.00 meter/second. What is the velocity v? 8.00 meter/ 9.00 second Dr. Hewitt has clay "blobs" hanging on either side of his head in this video. When he turns around, what happens to the blobs? a. The blobs fall off Dr. Hewitt's head. b. The blobs tend to stay where they were. c. The blobs turn around in the same direction as Dr. Hewitt. d. The blobs turn around in the opposite direction from Dr. Hewitt. Why do the clay blobs do what they do when Dr. Hewitt turns around? a. They have inertia−−the tendency of an object at rest to stay at rest. b. Dr. Hewitt is holding them there. c. Friction with the head is keeping them there. d. Dr. Hewitt is turning them back to their original position. Some alphabet letters are floating in a bowl of soup. You want to move a letter that is far away from you closer to you. How could you rotate the bowl to do that? a. Unfortunately, neither rotating the bowl clockwise nor rotating it counterclockwise will work. b. Rotate the bowl counterclockwise. c. Rotate the bowl either clockwise or counterclockwise, depending on where the letter is located. d. Rotate the bowl clockwise. Why do the alphabet letters tend to do what they do when you rotate the bowl? a. They have inertia−−the tendency of an object at rest to stay at rest. b. The letters are heavier than the soup, so they cannot move even though the soup moves. c. The soup prevents the letters from moving. d. The sides of the soup bowl prevent the letters from moving. When Dr. Hewitt pulls the tablecloth, what happens to the items on the tablecloth? a. They tend to stay where they were. b. They move vertically upward. c. They move horizontally in the opposite direction from the tablecloth. d. They move horizontally in the same direction as the tablecloth. When Dr. Hewitt pulls the tablecloth, why do the items on the tablecloth do what they do? a. Their inertia is sufficient to keep them there. b. Friction with the table is keeping them there. c. Friction with the tablecloth is keeping them there. d. They are attached to the tablecloth. You tell your friend about the neat tablecloth trick that Dr. Hewitt demonstrated. Your friend tries to repeat this trick at home and later complains to you that it failed. Which of the following is most likely the reason that it failed? a. Your friend pulled the tablecloth too slowly. b. Your friend pulled the tablecloth too quickly. c. The items placed on the tablecloth were too light. d. Your friend is too clumsy. Find the strength of the net force produced by a 20-NN force and a 8.0-NN force in each of these cases. Both forces act in the same direction. F= 28 N Find the strength of the net force produced by a 20-NN force and a 8.0-NN force in each of these cases. The two forces act in opposite directions. F = 12 N Suppose a monkey weighs 102 NN and the vine supporting her pulls upward with a force of 150 NN. What is the net force on the monkey? 48 N Suppose a monkey weighs 102 NN and the vine supporting her pulls upward with a force of 150 NN. Describe her motion. a. The monkey moves upward with a constant speed while the force acts. b. The monkey moves downward with a constant speed while the force acts. c. The monkey accelerates upward while the force acts. d. The monkey accelerates downward while the force acts. When the strong man shown (Figure 1) exerts a downward force of 890 NN on the rope, how much upward force is exerted on the block? 890 N The equilibrium rule F = 0 applies to a. objects or systems at rest. b. objects or systems in uniform motion in a straight line. c. both d. neither The support force on a 10-N book that rests on a horizontal surface is a. less than 10 N. b. greater than 10 N. c. 10 N. d. dependent on whether the book lies flat or stands upright. Lucy Lightfoot stands with one foot on one bathroom scale and her other foot on a second bathroom scale. Each scale reads 400 NN . What is Lucy's weight? W = 800 N In general, the friction forces between one object and another act a. in opposite directions. b. in the same direction. c. at right angles to each other. d. none of the above Why do we say that velocity is a vector and speed is not? a. Velocity happens in three dimensions, and speed happens in two dimensions. b. Velocity has a vertical component, and speed does not. c. Speed is never zero, and velocity can be zero. d. Velocity includes a direction, and speed does not. Does the speedometer on a vehicle show average speed or instantaneous speed? a. average velocity b. average speed c. instantaneous speed d. instantaneous velocity The sketch shows a painter's scaffold in mechanical equilibrium. The person in the middle weighs 540 N, and the tension in each rope is 460 N What is the weight of the scaffold? W = 380 N How can you use the graph of velocity versus time to estimate the acceleration of the ball? a. by estimating the value of the area under the graph b. by estimating the value from the vertical axis of the graph c. by estimating the value from the horizontal axis of the graph d. by estimating the value of the slope of the graph