MCQs - Moalims.com
... 22. When a tennis ball is allowed to fall freely in air toward the ground. It is found that it acquires a uniform velocity. This is because the __________. (Weight of the ball does not act beyond a certain speed, Upthrust of the displaced air supports the ball, Frictional force caused by the air inc ...
... 22. When a tennis ball is allowed to fall freely in air toward the ground. It is found that it acquires a uniform velocity. This is because the __________. (Weight of the ball does not act beyond a certain speed, Upthrust of the displaced air supports the ball, Frictional force caused by the air inc ...
Lab M5: Hooke`s Law
... Part 1: Measurement of the spring constant Begin by weighing the spring (you will need the weight in part 2). You might want to check the reliability of the digital balances by weighing the spring on two different balances. Use the digital balances with 0.1g resolution. The spring used in this lab h ...
... Part 1: Measurement of the spring constant Begin by weighing the spring (you will need the weight in part 2). You might want to check the reliability of the digital balances by weighing the spring on two different balances. Use the digital balances with 0.1g resolution. The spring used in this lab h ...
Physics for Proctologists
... 2. What’s Newton’s 1st Law?: If an object at rest feels no net force, then it will stay at rest; if a moving object feels no net force, then it will maintain the same velocity (speed & direction). 3. What’s Newton’s 2nd Law?: FNET=ma. You must calculate net force from a diagram first. Then set the n ...
... 2. What’s Newton’s 1st Law?: If an object at rest feels no net force, then it will stay at rest; if a moving object feels no net force, then it will maintain the same velocity (speed & direction). 3. What’s Newton’s 2nd Law?: FNET=ma. You must calculate net force from a diagram first. Then set the n ...
ch08_LecturePPT
... rotational velocity of 5 rev/s about a vertical axis. The rotational inertia of the wheel is 2 kg·m2 about its center and the rotational inertia of the student and wheel and platform about the rotational axis of the platform is 6 kg·m2. What is the initial angular momentum of the system? a) ...
... rotational velocity of 5 rev/s about a vertical axis. The rotational inertia of the wheel is 2 kg·m2 about its center and the rotational inertia of the student and wheel and platform about the rotational axis of the platform is 6 kg·m2. What is the initial angular momentum of the system? a) ...
Momentum
... C) equal in magnitude but opposite in direction to their original velocities. D) less in magnitude and in the same direction as their original velocities. E) less in magnitude and opposite in direction to their original velocities. Answer: A 18. Two equal masses travel in opposite directions with eq ...
... C) equal in magnitude but opposite in direction to their original velocities. D) less in magnitude and in the same direction as their original velocities. E) less in magnitude and opposite in direction to their original velocities. Answer: A 18. Two equal masses travel in opposite directions with eq ...
Chapter 10 Formation and evolution of the Local Group
... overcame the general expansion and they began to approach each other. At present they are ∼750 kpc apart and approaching at ∼120 km s−1 . Formation models that only consider the two major galaxies in the LG are of course an oversimplification. The relative motions and distances of other LG members c ...
... overcame the general expansion and they began to approach each other. At present they are ∼750 kpc apart and approaching at ∼120 km s−1 . Formation models that only consider the two major galaxies in the LG are of course an oversimplification. The relative motions and distances of other LG members c ...
Center of Mass/Momentum 1. An L-shaped piece, represented by
... C) equal in magnitude but opposite in direction to their original velocities. D) less in magnitude and in the same direction as their original velocities. E) less in magnitude and opposite in direction to their original velocities. Answer: A 18. Two equal masses travel in opposite directions with eq ...
... C) equal in magnitude but opposite in direction to their original velocities. D) less in magnitude and in the same direction as their original velocities. E) less in magnitude and opposite in direction to their original velocities. Answer: A 18. Two equal masses travel in opposite directions with eq ...
PH607lec08
... the underlying luminosity distribution • Few E galaxies actually have flat luminosity profiles at small radii; instead, the profiles rise inward to the last measured point . • Cores may exhibit unusual kinematics; for example, about a quarter of all elliptical galaxies have cores which appear to cou ...
... the underlying luminosity distribution • Few E galaxies actually have flat luminosity profiles at small radii; instead, the profiles rise inward to the last measured point . • Cores may exhibit unusual kinematics; for example, about a quarter of all elliptical galaxies have cores which appear to cou ...
Torque & Rotation
... Torque requirement on your tires lug nuts is 190 Nm. If you have a wrench which is .25 m, how hard do you have to push? ...
... Torque requirement on your tires lug nuts is 190 Nm. If you have a wrench which is .25 m, how hard do you have to push? ...
PowerPoint Presentation - Chapter 15 Thermodynamics
... rotational velocity of 5 rev/s about a vertical axis. The rotational inertia of the wheel is 2 kg·m2 about its center and the rotational inertia of the student and wheel and platform about the rotational axis of the platform is 6 kg·m2. What is the initial angular momentum of the system? a) ...
... rotational velocity of 5 rev/s about a vertical axis. The rotational inertia of the wheel is 2 kg·m2 about its center and the rotational inertia of the student and wheel and platform about the rotational axis of the platform is 6 kg·m2. What is the initial angular momentum of the system? a) ...
Appendix B: On inertial forces, inertial energy
... not a geodesic), resists its deviation from its geodesic (i.e. inertial) path in spacetime, and exerts a real inertial force on the obstacle that deforms the particle’s worldline. The geodesic hypothesis has been proved by the experimental fact that particles falling towards the Earth’s surface do n ...
... not a geodesic), resists its deviation from its geodesic (i.e. inertial) path in spacetime, and exerts a real inertial force on the obstacle that deforms the particle’s worldline. The geodesic hypothesis has been proved by the experimental fact that particles falling towards the Earth’s surface do n ...
2-d motion - U of M Physics
... The problems in this laboratory will help you investigate objects moving in uniform circular motion. This is the same motion that describes satellites in orbit around the earth, or objects whirled around on a rope. Circular motion can be explained with the same concepts as those used in explaining p ...
... The problems in this laboratory will help you investigate objects moving in uniform circular motion. This is the same motion that describes satellites in orbit around the earth, or objects whirled around on a rope. Circular motion can be explained with the same concepts as those used in explaining p ...
ME 230 Kinematics and Dynamics
... Fortunately, only change its direction with respect to time. Hence during the time interval t, a change of r will not cause a change in the direction of uθ. However, a change will cause u to change to u′ , where ′ ...
... Fortunately, only change its direction with respect to time. Hence during the time interval t, a change of r will not cause a change in the direction of uθ. However, a change will cause u to change to u′ , where ′ ...
Physics 207: Lecture 2 Notes
... =R d F dW = FTangential dr f axis of R dW = (FTangential R) d rotation dr =Rd d dW = t d (and with a constant torque) We can integrate this to find: W = t t(f-i) Analogue of W = F •r W will be negative if t and have opposite sign ! Physics 207: Lecture 14, Pg 25 ...
... =R d F dW = FTangential dr f axis of R dW = (FTangential R) d rotation dr =Rd d dW = t d (and with a constant torque) We can integrate this to find: W = t t(f-i) Analogue of W = F •r W will be negative if t and have opposite sign ! Physics 207: Lecture 14, Pg 25 ...
Chap8
... Center of Mass and Stability An object is said to be stable if an external force is required to tip it. The object is stable as long as the direction of the torque due to its weight, τw tends to keep it upright. This occurs as long as the object’s center of mass lies above its base. To tip the objec ...
... Center of Mass and Stability An object is said to be stable if an external force is required to tip it. The object is stable as long as the direction of the torque due to its weight, τw tends to keep it upright. This occurs as long as the object’s center of mass lies above its base. To tip the objec ...
Modified Newtonian dynamics
In physics, modified Newtonian dynamics (MOND) is a theory that proposes a modification of Newton's laws to account for observed properties of galaxies. Created in 1983 by Israeli physicist Mordehai Milgrom, the theory's original motivation was to explain the fact that the velocities of stars in galaxies were observed to be larger than expected based on Newtonian mechanics. Milgrom noted that this discrepancy could be resolved if the gravitational force experienced by a star in the outer regions of a galaxy was proportional to the square of its centripetal acceleration (as opposed to the centripetal acceleration itself, as in Newton's Second Law), or alternatively if gravitational force came to vary inversely with radius (as opposed to the inverse square of the radius, as in Newton's Law of Gravity). In MOND, violation of Newton's Laws occurs at extremely small accelerations, characteristic of galaxies yet far below anything typically encountered in the Solar System or on Earth.MOND is an example of a class of theories known as modified gravity, and is an alternative to the hypothesis that the dynamics of galaxies are determined by massive, invisible dark matter halos. Since Milgrom's original proposal, MOND has successfully predicted a variety of galactic phenomena that are difficult to understand from a dark matter perspective. However, MOND and its generalisations do not adequately account for observed properties of galaxy clusters, and no satisfactory cosmological model has been constructed from the theory.