## Physics Questions and Answers

### A football player runs 11m [N20E]. He then changes direction and then runs 9m [E]. What is his total displacement?

### A ball is thrown horizontally, its initial speed is 10 m/s. It hits the gound after 4 seconds. How far away did it travel from its starting point?

### A car with 62 cm diameter tires accelerates uniformly from rest to 20m/s in 10s. How many times does each tire rotate? Thanks a lot in advance

### there is a special incident ray that reflects right back to itself how would you aim this incident ray to achieve that effect ? what is the angle of incidence of this incident ray/

### Three factors which determine the horizontal distance traveled: how does the velocity changes in each direction? An object is projected horizontally. what are three factors which determine the horizontal distance traveled, and describe how each factor affects this distance, how does the velocity changes in each direction?

### How much work does the electric field do in moving a proton from a point with a potential of +125 V to a point where it is -55.0 V? Express your answer both in joules and electron volts, please.

### 93 Million Miles To Meters

### A 4357 kg roller coaster starts from rest at the top of a 36.5 m high track. Determine its speed of the car at the top of a loop that is 10.8 m high.

### Should I choose a career in Physics or Chemistry? I'm at the end of high school, and still undecided about my future studies. I love both Physics and Chemistry, and tend to work well at school in both. I wish to do my masters and eventually PhD and get into research and academia. What are the merits of doing Physics or Chemistry? What is it like to be a physicist? Or a chemist? Please help!

### How much current is flowing in a wire 4.8 m long if the maximum force on it is 0.75 N when placed in a uniform 0.08 T field?

### An electron acquires 7.45 x 10^-17 J of kinetic energy when it is accelerated by an electric field from plate A to plate B. (a) What is the potential difference between the plates and (b) Which plate is at the higher potential?

### At what distance from a long straight wire carrying a current of 5.0 Amps is the magnitude of the magnetic field due to the wire equal to the strength of earth's magnetic field of about 5.0 x 10^-5 T ?

### Can you show how to calculate the magnitude of the magnetic force on a 160 meter length of straight wire stretched between two towers carrying a 150-A current? The earth's magnetic field of 5.0 x 10^-5 T makes an angle of 65 degrees with the wire.

### If a material has an index of refraction of 2.25, what is the speed of light through it?

### Light enters a substance from air at an angle of 32 degrees, and continues at an angle of 23 degrees. What is the index of refraction of the substance?

### Use Hooke's Law to determine the variable force in the spring problem. An overhead garage door has two springs, one on each side of the door. A force of 15 pounds is required to stretch each spring 1 foot. Because of the pulley system, the springs stretch only one-half the distance the door travels. The door moves a total of 8 feet, and the springs are at their natural length when the door is open. Find the work done by the pair of springs.

### A canoe has a velocity of 0.40m/s southeast relative to the earth. The canoe is on a river that is flowing 0.50m/s east. Find the velocity... A canoe has a velocity of 0.40m/s southeast relative to the earth. The canoe is on a river that is flowing 0.50m/s east relative to the earth. Find the velocity (magnitude and direction) of the canoe relative to the river.

### How can I drop a raw egg 100 feet from the air without breaking it? The egg can't be boiled and we can use any thing we would like to use.

### Can you describe the effect on friction force on the surface of Mars? How about the surface of Jupiter? (in regards to a refrigerator or a cabinet) What would happen to friction force in each of these situations and why?

### If an electric wire is allowed to produce a magnetic field no larger than that of earth (5.5 x 10^-5 T) at a distance of 25 cm, what is the maximum current the wire can carry?

### A +35 "mu"C point charge is placed 32 cm from an identical +35 "mu"C charge. What is the electric potential at the point midway between the two charges?

### How much work does the electric field do in moving a -7.7 `muC` charge from ground to a point where potential is +55 V higher?

### A marble is shot at an angle of 30 degrees and has an initial velocity of 40 m/s. How many seconds to reach the ground and how far away does it land?

### why ray of light passes undeviated through optics centre of a lens?

### A lighted candle is 10 m away from a wall. A concave mirror is being used to project an image of the candle onto the wall. If the image is going to be 3.0 times the size of the object, how far should the mirror be from the wall?

### A parallel-plate capacitor consistsof plates of area 1.5 x 10^-4 m^2. And separated by 1.0 mm. The capacitor is connected to a 12 -V battery. (a) What is the capacitance? (b) What is the charge on the plates? (c) How much energy is stored in the capacitor?

### Consider two copper wires. One has twice the length of the other. How do the resistivities of these two wires compare?

### A power station delivers 600 kW of power at 12,000 V to a factory. What current is required to deliver this power The wires from the power station to the factory have a total resistance of 3.0 ohm. What is the power dissipated by the current in the wires?

### Why is it so hard to get students to learn even simple physics? Why is it so hard to get students to learn even simple physics o_O !!

### An optic fiber is made of clear plastic with index of refraction of 1.50. For what angles of incidence will light remain within the plastic?

### An object is 2.3 cm tall, and 5.5 cm from a converging lens. The image is upright and 9.0 cm tall. What is the focal length of the lens? (Using the magnification fo find the image distance)

### What is the direction of the magnetic field lines of force due to current loop of circular shape? Physics

### A car goes on a straight road 15 m/s, acceleration at a constant rate of speed of 21 m/s^2 in 12 seconds, what is the total distance traveled in 12 seconds? Can you show how you got the answer so I can understand it. Thanks.

### What Is Physics

### A 75 nC charge is 8.0 m from a second charge, and the force between them is 1.0 N. What is the magnitude of the second charge?

### A ball is thrown verticallyup at 10m/s.returns to ground with a velocity of 9m/s. What is the maximum height attained by the ball?

### If you shoot an object from a canon at a 90 degree angle, and it travels 6 meters in 6.76 seconds, what is its velocity? What is the formula used?

### A garbage truck crashes head-on with a Volkswagen and the two come to rest in a cloud. Which experiences the greater impact force?

### How do you find the answer, I know it's simple, but I'm missing it! A horizontal force is used to pull a 5.0 kg cart at a constant speed of 5.0 m/s across the floor. If the force of friction between the cart and the floor is 10.0N, the the horizontal force on the handle of the cart is.....?

### Question on point charge particles in a square Two pos. and two neg. point particles, all with charge of magnitude q = 5nC, are placed at the 4 corners of a 10 cm-side square as shown. (http://tinypic.com/r/2zrgnwi/6)(a) Determine the electric ﬁeld, magnitude and direction, at the center of the square.(b) Determine the energy required to assemble these four point charges from far apart to the present conﬁguration.(c) An electron (me = 9.11 x 10^-31 kg) is placed at the center of the square with zero initial velocity. Determine its instantaneous acceleration, both direction and magnitude, due to the four point charges at the corners. Any help would greatly be appreciated!

### If the net force of an object is 0, what is it most likely doing? a) it's at restb) it's acceleratingc) it's in uniform motiond) either a) or c)

### A wire of length 55.5 cm carrying 8.75 Amps flows through a uniform magnetic field. The wire experiences a maximum force of 1.28 N toward the south when the current flows toward the east. What is the magnitude and direction of the magnetic field?

### How can I solve this question of Dynamics ??

### What gas can be used to produce the following result? I want to achieve temperatures of between 30 deg C and 40 deg. C with a pressure range of less than 50 psi. I am trying to create a room heating system that requires no external energy. It would be completely off the grid and have zero polluting factors.

### A uniform electric field of 50 V/m is directed toward the east. If the voltage measured relative to ground at a given point is 80 V, what is the voltage at a point 1.0 m directly west of that point?

### What happens to the energy of the system The oscillations of an actual spring-block system slowly reduce in amplitude and finally the system comes to a halt. What happens to the energy of the system? Does this not violate the law of conservation of energy?

### An object is 2.3 cm tall, and 5.5 cm from a converging lens. The image is upright and 9.0 cm tall. What is the focal length of the lens?

### Light is passing through a transparent material at an angle of 63 degrees. The material has an index of refraction of 1.6. At what angle will the light pass into the air?

### Light enters a substance from air at 45 degrees to the normal. It continues through the substance at 34.7 degrees to the normal. What would be the critical angle for this substance?

### If the electricity delivered to a factory is at 50,000 Volts, What is the current use and the power dissipated in the wires at 50,000 Volts?

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