What is Masteringphysics: Definition and 18 Discussions

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1. MasteringPhysics: Find the angle between the point charges.

Homework Statement Two m = 4.0 g point charges on 1.0-m-long threads repel each other after being charged to q = 80 nC , as shown in the figure. What is the angle θ? You can assume that θ is a small angle. Homework Equations Fe=kq2/r2 F=ma Fg=mg The Attempt at a Solution Equation 1:[/B] r =...
2. Percentage of Original KE that is Convertible

Homework Statement A 18-kg child is sliding on an icy surface toward her mother at 3.0 m/s. Her 62-kg mother starts toward her at 2.0 m/s, intending to catch her. Homework Equations KEi= (1/2) (m1)(v1)^2 + (1/2) (m2)(v2)^2 KEconv= (1/2)μ(v12)^2 μ= (m1m2)/(m1+m2) v12= |v2 - v1 | The Attempt at...
3. What is the x component of .... ?

What is the x component of (+2m)ι^? Express your answer with the appropriate units. x = ____ __ * My attempted answer was: +2m What is the x component of (+2m/s)ι^? Express your answer with the appropriate units. vx = ____ __ * My attempted answer was: +2m/s What is the x component of...
4. What is the speed of sound in oxygen? 21.50mastering physics

Homework Statement ___ In 1866, the German scientist Adolph Kundt developed a technique for accurately measuring the speed of sound in various gases. A long glass tube, known today as a Kundt's tube, has a vibrating piston at one end and is closed at the other. Very finely ground particles of...
5. Is this mastering physics problem incorrect?

Homework Statement [/B] This is the Diagram-The figure shows the circular wave fronts emitted by two wave sources. https://session.masteringphysics.com/problemAsset/1383558/3/21.EX26.jpg part B is the one with trouble it asks "Make a table with rows labeled P, Q, and R and columns labeled r1...
6. Angular Velocity and Acceleration for Elevator Mechanism

Homework Statement In a charming 19th-century hotel, an old-style elevator is connected to a counterweight by a cable that passes over a rotating disk 3.50m in diameter (the figure (Figure 1) ). The elevator is raised and lowered by turning the disk, and the cable does not slip on the rim of...
7. Planet density -- no idea what to do

Homework Statement [/B] Consider a spherical planet of uniform density ρ. The distance from the planet's center to its surface (i.e., the planet's radius) is Rp. An object is located a distance Rfrom the center of the planet, where R<Rp. (The object is located inside of the planet.) Find a...
8. The smallest angle flashlight beam can make with horizontal

Homework Statement At the aquarium where you work, a fish has gone missing in a 10.5m -deep, 9.45m -diameter cylindrical tank. You shine a flashlight in from the top edge of the tank, hoping to see if the missing fish is on the bottom. What’s the smallest angle your flashlight beam can make...
9. Air Track Elastic Collision: Solving for Final Velocities

Homework Statement A 0.159kg glider is moving to the right on a frictionless, horizontal air track with a speed of 0.870m/s . It has a head-on collision with a 0.310kg glider that is moving to the left with a speed of 2.15m/s . Suppose the collision is elastic. a) Find the magnitude of the...
10. Torque v. Time Graph -- Find angular velocity

Homework Statement An object whose moment of inertia is 3.00kgm2experiences the torque shown in the figure (Figure 1) . What is the object's angular velocity at 2.80s ? Assume it starts from rest. http://session.masteringphysics.com/problemAsset/1073771/4/knight_Figure_13_21.jpg Homework...
11. MasteringPhysics 8.82: Conservation of Energy/Momentum Problem

A 0.150-kg frame, when suspended from a coil spring, stretches the spring 0.070 m . A 0.200-kg lump of putty is dropped from rest onto the frame from a height of 30.0 cm Find the maximum distance the frame moves downward from its initial position. To start off the question, I found the...
12. Simple circuit analysis w/ voltage sources - MasteringPhysics wrong?

Homework Statement We are given a simple circuit with 4 resistors, a known voltage source, and an unknown voltage source. The photo is below in my solution attempt.Homework Equations V=IR, R(parallel)=(1/R1+1/R2)^-1The Attempt at a Solution I found the voltage drop over the given resistor, then...
13. X and y coordinates, integration, semicircular plate (masteringphysics)

Homework Statement Use equations x_{cm}=\frac{1}{M}\int x dm and y_{cm}=\frac{1}{M}\int y dm to calculate the x- and y-coordinates of the center of mass of a semicircular metal plate with uniform density \rho and thickness t. Let the radius of the plate be R. The mass of the plate is thus...
14. Work on Block in Vertical Circle: MasteringPhysics

Homework Statement A small block with mass 0.0325 kg slides in a vertical circle of radius 0.475 m on the inside of a circular track. During one of the revolutions of the block, when the block is at the bottom of its path, point A, the magnitude of the normal force exerted on the block by...
15. Kinetic energy problem (masteringphysics)

Homework Statement The gravitational pull of the Earth on an object is inversely proportional to the square of the distance of the object from the center of the earth. At the Earth's surface this force is equal to the object's normal weight mg, where g=9.8m/s^2, and at large distances, the...
16. Reference framefrom masteringphysics

This is the only problem taht i could not figure out for 2 hours... I even asked one of my friend who got 5 on his ap exam about this problem..he said no no to this question..anybody willin to help? .Susan, driving north at 60 mph, and Shawn, driving east at 45 mph, are approaching an...
17. A bunch of MasteringPhysics problems that I don't understand

SHM with torque? Springs and frequency mass relation? Problem 1 A slender, uniform, metal rod with mass M is pivoted without friction about an axis through its midpoint and perpendicular to the rod. A horizontal spring with force constant k is attached to the lower end of the rod, with the...
18. Tangential Speed and Time in a Horizontal Circle Formula | Physics Problem

ok this stupid program is starting to piss me off again (sry for the french) ok the question is: What tangential speed, , must the bob have so that it moves in a horizontal circle with the string always making an angle theta from the vertical? Express your answer in terms of some or all...