Explore BrainMass


Physics Questions

1. There is an analogy between rotational and translational physical quantities. Identify the rotational term analogous to each of the following linear quantities: acceleration, force, mass, work, translational kinetic energy, linear momentum, impulse. (Example: impulse F Delta-t corresponds to angular impulse, tau Delta-t . (Gr

Physics Questions

1. (a) What is the momentum of a 1.20 x 10^4 kg garbage truck moving at 30.0 m/s? (b) At what speed would an 8.00 kg trash can have the same momentum? 2. One hazard of space travel is debris left by previous missions. There are several thousand masses large enough to detect by radar orbiting the earth, but there are far grea

Solving for Force

Here is the problem: I don't understand what x and y in the force is for. Please show full solution A force F = (4x i + 4y j) N acts on an object as it moves in the x direction from the origin to x = 4.94 m. Find the work W = F · dr done on the object by the force.

Frequency, Amplitude, Mass

A spring of force constant 4.0 N/m oscillates with a period of 1.0 sec. with a particular mass m attached. A total energy of 0.130 J is put into the spring-mass system. What is the frequency of the motion? Find the amplitude of the motion. Find the value of the mass, m. What is the speed of the mass when its displacement is 15.0

Need some help on a take home assignment to

1, Three identical balls are thrown from the top of a building, all with the same initial speed. Ball 1 is thrown horizontally, ball 2 is thrown at some angle above the horizontal, and ball 3 is thrown at some below the horizontal. Rank the speed of the balls as they reach the ground from fastest to slowest. A,1-2-3 B,2-1-3

Magnetism - Sliding mass with charge

A body of mass m and charge +q slides down a frictionless slope inclined at an angle theta to the horizontal. A magnetic field B is directed across the slope and into the paper as on the diagram. a) Draw a clear free-body diagram for the body as it moves with velocity v down the slope. Indicate all the forces acting on the ch

Electric fields/ electric flux/ electric potential energy

1.The anode (positive terminal) of an X-ray tube is at a potential of +90 000 V with respect to the cathode (negative terminal). (a) How much work (in joules) is done by the electric force when an electron is accelerated from the cathode to the anode? (b) If the electron is initially at rest, what kinetic energy does the el


(See attached file for full problem description and diagrams) --- 3. The filament of a light bulb has a resistance of 580 Ω. A voltage of 120 V is connected across the filament. How much current is in the filament? 13. A cylindrical copper cable carries a current of 1200 A. There is a potential difference of 1.


Which is the correct answer. During an evening news broadcast in Helsinki, Finland, the meteorologist indicated that the day's lowest temperature was -4.0 °C. What is the corresponding value of this temperature on the Fahrenheit scale? A -7.2 °F B -4.0 °F C 17 °F D 25 °F E 39 °F Complete th


Please help with a brief explanation for each of the following questions 1. If you fill a glass bottle with water and seal it tight and leave it in a hot car on a summer day, it will break (I can testify to this from personal experience!). Likewise, if you fill a glass bottle with water and seal it tight and put it in yo

Dimensional analysis

The period of a simple pendulum, defined as the time necessary for one complete oscillation, is measured in time units and is given by T=2pi sqrt(l/g) Where l is the length of the pendulum and g is the acceleration due to gravity, in units of length divided by time squared. Show that this equation is dimensionaly consistent. (

Relative mass, gravitational force, and tension

(See attached file for full problem description) --- 1. An astronaut orbits the earth in a space capsule whose height above the earth is equal to the earth's radius. How does the mass of the astronaut in the capsule compare to her mass on the earth? A It is equal to her mass on earth. B It is equal to one-half of he

Various Physics (Mechanics) Problems

(See attached file for full problem description) --- 37. A block whose weight is 45.0 N rests on a horizontal table. A horizontal force of 36.0 N is applied to the block. The coefficients of static and kinetic friction are 0.650 and 0.420, respectively. Will the block move under the influence of the force, and, if so, what wi

Mathematical Conceptualization of Force, Mass, and Acceleration

A 810-kg car accelerates from rest to 27 m/s in a distance of 120 m. What is the magnitude of the average net force acting on the car? A 740 N B 2500 N C 91 N D 1300 N E 7900 N Two forces act on a 4.5-kg block resting on a frictionless surface as shown (see attached file). What is the magnitude of the

Classical Mechanics - Speed of a Ferry and Parabolic Curve of a ball

A ferry can travel at an optimal speed of 8 km/h in still water measured relative to the shore. What is the optimal speed of the ferry, relative to the shore, if it moves perpendicular to a 6 km/h current? A 4 km/h B 8 km/h C 10 km/h D 14 km/h E 28 km/h A baseball is hit upward and travels along a pa

Basic Math applications to Classical Mechanics

A park ranger wanted to measure the height of a tall tree. The ranger stood 6.10 m from the base of the tree; and he observed that his line of sight made an angle of 73.5° above the horizontal as he looked at the top of the tree. What is the height of the tree? A .5.84 m B 8.77 m C 11.7 m D 17.3 m E 20.6

Mathematical Concepts

7. A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 4.0 m/s. The car is a distance d away. The bear is 26 m behind the tourist and running at 6.0 m/s. The tourist reaches the car safely. What is the maximum possible value for d? 19. In getting ready to slam-dunk the ball

Kinematics and Vector Questions

I need some help with these two physics questions on vectors: 33. An ocean liner leaves New York City and travels 18.0° north of east for 155 km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ship's displacement vector in the directions (a) due east and (b) due

Mathematical Concepts

11. You are driving into St. Louis, Missouri, and in the distance you see the famous Gateway-to-the-West arch. This monument rises to a height of 192 m. You estimate your line of sight with the top of the arch to be 2.0° above the horizontal. Approximately how far (in kilometers) are you from the base of the arch? 21.

Charge and Work

Please help me with the circled problems. Thanks. Questions: 87. Points R and T are each a distance f from each of the two particles with charges of equal magnitudes and opposite signs as shown. If ... the work required to move a particle with the negative charge q from R to T is .... Please see the attached for the

Charges, spherical shell, and charge density

Please show all work and show all equations used and diagrams, etc. etc. so I understand completely please. 1) Charge is placed on the surface of a 2.7cm radius isolated conducting sphere. The surface density charge is uniform and has the value 6.9*10^-6C/m^2. The total charge on the sphere is: 2) A spherical shell has a

Electrostatic Forces and Movement of Charged Particles

Please show all work and diagrams plus equations used to solve problem. Thanks! 1) Particles 1, with charge q1 and 2, with a charge q2 are on the x axis, with particle 1 at x = a with and particle 2 at x=-2a. For the net force on a third charges particle, at the origin to be zero q1 and q2 must be related by q2=: (answer B

Charges and Forces

Please show all work and diagrams plus equations used to solve problem. Thanks! 1) A small object has charge Q. Charge q is removed from it and placed on a second small object. The two objects are placed 1 meter apart. For the force that each object exerts on the other to be a maximum, q should be: 2) Two small charged