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Recent Homework Questions About Physics
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college physics
Three glass Christmas balls become electrically charged when Noel removes them from the packaging material in their box. Noel hangs the balls on the tree 0.2m apart at an angle of 60 degree from each other. If each ornament has aquired a charge of 2 x 10^-10C, What is the magn...
college physics
Three identical charges (q = +5.0mC) are along a circle with radius of 2.0m at angles of 30, 150, and 270 degrees. What is the the resultant electric field at the center?
college physics
A ray of light traveling in air strikes the midpoint of one face of an equiangular glass prism (n = 1.50) at an angle of exactly 30 degrees. a)Trace the path of the light ray through the glass, and find the angle of incidence of the ray at the bottom of the prism. b) Will the ...
college physics
The deepest section of ocean in the world is the Mariana Trench, located in the Pacific Ocean. Here, the ocean floor is as low as 10,918m below the surface. If the index of refraction of water is 1.33, how long would it take a laser beam to reach the bottom of the trench?
college physics
What is the speed of light moving through a medium of index of refraction 2.45?
college physics
As wavelengths decreases, energy _____.
college physics
Light may be considered to travel as a ________ or a ________.
physics
The deepest section of ocean in the world is the Mariana Trench, located in the Pacific Ocean. Here the ocean floor is as low as 10,918m below the surface. If the index of refraction of water is 1.33, how long would it take a laser beam to reach the bottom of the trench?
physics
what is the speed of light moving through a medium of index of refraction 2.45?
physics
As wavelength decreases, energy ?
Physics
light may be considered to travel as a ? or a ?
physics
An object of mass 10.0 kg is released from the top of an inclined plane which makes an angle of inclination of 30 degrees with the horizontal. The object slides along the inclined plane. The questions refer to the instant when the object has traveled through a distance of 2.00...
physics
true or false 1. The work required to stretch a spring changes linearly with the amount of strech? 2. The kinetic energy of an object increases linearly as the velocity of the object increases? 3. Kinetic energy is proportional to speed? 4. Kinetic energy is proportional to ma...
Physics
how do you solve for amplitude?
physics
a car travels along a highway with a velocity of 24m/s, west. then exits the highway and 4s later, its instantaneous velocity is 16m/s, 45degrees north of west. Calculate the magnitude of the average accelaration of the car during the 5s interval?
College physics
A ray of red light, for which n=1.54, and a ray of violet light, for which n=1.59, travel through a piece of glass. They meet right at the boundary between the glass and the air, and emerge into the air as one ray with an angle of refraction of 22.5. What is the angle between ...
College physics
A thin glass rod is submerged in oil. What is the critical angle for light traveling inside the rod?
Physics helpp!!
A baseball is thrown horizontally off a cliff with a speed of 24 m/s. What is the horizontal distance, to the nearest tenth of a meter, from the face of the cliff after 2.8 seconds? To the nearest tenth of a meter, how far has it fallen in that time? So is 24 m/s Vx or Vox? Do...
College physics
A student has built a 20-cm-long pinhole camera for a science fair project. She wants to photograph the Washington Monument, which is 167 m (550 ft) tall, and to have the image on the film be 5.0 cm high.
Physics
I have two questions, both are about angular momentum so I thought I'd post them together. I'm really confused on anything regarding rolling wheels and things like that (help me please!. It seems as though the whole chapter was amassed of all of the topics I cant wrap ...
Physics
A 2.1 kg particle-like object moves in a plane with velocity components vx = 30 m/s and vy = 55 m/s as it passes through the point with (x, y) coordinates of (3.0, -4.0) m. (a) What is its angular momentum relative to the origin at this moment? kg · m2/s (b) What is its...
physics
"A one meter board with uniform density, hangs in static equilibrium from a rope with tension T. A weight hangs from the left end of the board 0.2m away in distance. What is the mass of the board"
physics
A diesel engine takes in 0.5 moles of air at 20.0„aC and at atmospheric pressure. It then compresses it adiabatically to one twentieth of its original volume. Obtain the final temperature, pressure and volume of the compressed air? which formula should i use for this equa...
Physics
"At what point between two masses of 20kg and 15kg located 1.0m apart, will the gravitational field strength equal zero?"
Physics
"A workman sitting on top of a roof of a house drops his hammer. The roof is smooth and slopes at an angle of 30.0 degrees to the horizon. It is 32m long and its lowest point is 32m from the ground. How far from the house's wall is the hammer when it hits the ground?&...
Physics
(a)Assuming that only gravity is acting on it, how far does an electron have to be from a proton so that its acceleration is the same as that of a freely falling object at the Earth’s surface? (b)Suppose the Earth were made up only of protons but had the same size and mas...
physics
A 680 Hz tuning fork is held over a long vertical tube full of water. If the tube is 1.00 m long, how many resonances will be heard as the tube is allowed to empty from the bottom?
Physics
A dumbbell consists of two equal compact masses of 2 kg each, connected by a massless rod of length 0.8 metres. What is the moment of inertia of the dumbbell about an axis through the centre of, but perpendicular to, the rod? could someone just tell me how to get started on th...
Physics (Static Friction)
When you take your 1300-kg car out for a spin, you go around a corner of radius 56.9 m with a speed of 15.8 m/s. The coefficient of static friction between the car and the road is 0.75. Assuming your car doesn't skid, what is the force exerted on it by static friction? I g...
physics
In the figure we see two blocks connected by a string and tied to a wall, with theta = 33°. The mass of the lower block is m = 1.0 kg; the mass of the upper block is 2.0 kg. The tension of the string connecting the blocks is 5.337. Find the tension in the string that is ti...
Physics
The rigid object shown in Fig. 10-63 consists of three balls and three connecting rods, with M = 1.5 kg, L = 0.67 m, and θ = 32°. Fig. 10-63 The balls may be treated as particles, and the connecting rods have negligible mass. Determine the rotational kinetic energy of...
physics
A bullet with mass 0.40 kg is fired with an initial velocity of 400 m/s from a gun with mass 5.0 kg. The speed of the recoil of the gun is
PHYSICS Gr 12
A pilot is flying his aircraft in a vertical loop. He can't stand "feeling" more than 7.0 g's at the bottom of the loop. If he travels at 800km/h, what is the radius of his loop?
physics
A long, vertical, straight wire carries a current I going upwards. The wire is perpendicular to the plane of a circular metal loop and passes through the center of the loop. The loop is allowed to fall and maintains its orientation with respect to the straight wire while doing...
Physics - Another Question
"Three forces act at a single point. Two of the forces are 39N southwest and 45N north. What is the value of the third force that creates equilibrium?"
Physics
"Two wooden blocks A and B have respective masses of 3.0kg and 4.0kg and are connected with an inextensible cord. If the blocks are placed on a horizontal frictionless surface and a force of 8.0N is applied to A, find the tension in the connecting cord."
physics
Two objects attract each other with a gravitational force of magnitude 0.99 10-8 N when separated by 19.1 cm. If the total mass of the objects is 5.01 kg, what is the mass of each?
physics
a mass of 0.1kg falls freely under the action of gravity .find the force acting on it its momentum kinetic energy after 10s?
College physics
What is the effect of inserting a ferromagnet inside a winding coil where current flows? The effect is to Fill in the Blank 01 (increase/decrease) the magnetic field inside the coil compared to the field that would have been produced in free space. This also Fill in the Blank ...
physics II
A certain material is in a room at 27°C. If the absolute temperature (K) of the material is tripled, its resistance doubles. (Water freezes at 273 K.) What is the value for alpha (a) the temperature coefficient of resistivity?
physics
A step-down transformer has a turns ratio of 1:10 and its primary is connected across the terminals of a standard 120 V wall socket. A 330 ohm resistor is connected across the secondary of this transformer. What power P is dissipated in the resistor?
physics
The primary coil of a transformer is connected to a standard wall socket. A resistance R is connected across hte secondary coil. The resistance across the secondary coil is increased. What happens to the current in the primary coil, and what happens to the power being supplied...
Physics
The rigid object shown in Fig. 10-63 consists of three balls and three connecting rods, with M = 1.5 kg, L = 0.67 m, and θ = 32°. The balls may be treated as particles, and the connecting rods have negligible mass. Determine the rotational kinetic energy of the object...
Physics
Figure 10-42 shows a uniform disk that can rotate around its center like a merry-go-round. The disk has a radius of 2.00 cm and a mass of 20.0 grams and is initially at rest. Starting at time t = 0, two forces are to be applied tangentially to the rim as indicated, so that at ...
physics
When light strikes glass perpendicularly, about 5.5% is reflected at each surface. How much light is transmitted through a pane of window glass?
physics
A butterfly at eye level is 21 cm in front of an plane mirror. You are behind the butterfly, 53 cm from the mirror. What is the distance between your eye and the image of the butterfly in the mirror?
physics
One cool 5.0 degree C spring morning, Mason lays a brick sidewalk up to his house, placing the 25 cm long bricks end to end against eachother. However, Mason forgets to leave a space for expansion and when the temperature reaches 36 degree C, the bricks buckle. How high will t...
Physics
Rotational Inertia- Particle 1: m=50g x=2 cm y=2 cm P 2: m=25 x=0 y=4 P 3: m=25 x=-3 y=-3 P 4: m=30 x=-e y=4 The question says to find the rotational inertia of the collection about the x, y, and 7 axis in g/cm^2, then suppose the x axis rotational inertia is A and the y axis ...
physics
Bradley, working in his 23 C kitchen, is cooking himself a crepe in an iron skillet that has a circular bottom with a diameter of .30 m. How hot must the skillet be in order for Bradley to make a .07103 m^2 crepe that just fills the bottom of the pan? (coefficient of expansion...
physics
A 2-C and a 4-C charge attract each other with a 10-N froce when placed a certain distance apart. With how much force will a 2-C charge and an 8-C charge attract each other when placed the same distance apart? ** I know the answer, but can't find out how to solve it?? **
physics
Lucy is going skin diving to see coral off the coast of Mexico in sea water with a density of 1025 kg/m^3. If she were to hold her breath as she ascends to the waters surface a)by how many times would the volume of her lungs change assuming the water temperature remain constan...
physics
A water tower sits on top of a hill and supplies water to citizens below. The difference in pressure between the water tower and the Dailey's house is 1.1x10^5 Pa, while the difference in pressure between the tower and the Stearns' house is 3.2x10^5 Pa. a)which house s...
physics
A spring (k=200N/m) is fixed at the top of a frictionless plane inclined at an angle of 40 degrees. A 1 kg block is projected up the plane from an initial position that is distance d=0.60m from the end of the relaxed spring, with an initial kinetic energy of 16J. A) What is th...
Physics
The flywheel of a steam engine runs with a constant angular speed of 321 rev/min (in the counterclockwise direction). When steam is shut off, the friction of the bearings stops the wheel in 1.9 h. (a) What is the constant angular acceleration, in revolutions per minute-squared...
Physics
n early method of measuring the speed of light makes use of a rotating slotted wheel. A beam of light passes through one of the slots at the outside edge of the wheel, travels to a distant mirror, and returns to the wheel just in time to pass through the next slot in the wheel...
physics
A 2500N pile-driver ram falls 10m and drives a post 0.1m into the ground. Find the average impact of force on the ram.
11th Grade Physics
An aircraft has a take-off speed 180km/h and length 250m from the start just before take-off a serious snag is detected in the engine and the aircraft failed to take-off. There is a wall at a distance 'd' = 230m ahead of the take-off point. The pilot applies breaks whi...
physics
a swimming area in a rotating space habitat is located in a 1/4 g region. if a diver can jump 1m high in a 1g region, how high can the same diver jump in the swimming area?
physics
a swimming area in a rotating space habitat is located in a 1/4 g region. if a diver can jump 1m high in a 1g region, how high can the same diver jump in the swimming area?
11th Grade Physics
An aircraft has a take-off speed 180km/h and has length 250m from the start just before take-off a serious snag is detected in the engine and the aircraft failed to take-off. There is a wall at a distance 'd' = 230m ahead of the take-off point. The pilot applies breaks...
physics
a swimming area in a rotating space habitat is located in a 1/4 g region. if a diver can jump 1m high in a 1g region, how high can the same diver jump in the swimming area?
11th Grade Physics
The maximum speed of a bus is 72km/h, it accelerates uniformly at the rate of 1m/s^2 and retards uniformly at the rate of 4m/s^2. Find the least time in which it can do a journey of 1km ?
physics
Three point charges have equal magnitudes, two being positive and one negative. These charges are fixed to the corners of anequilateral triangle. The magnitude of each charge is 5 microCouloumbs, and the lengths of the sides of the triangle are 3.0cm.Calculate the magnitude of...
gen physics II
A beam of light is incident upon a flat piece of glass (n = 1.50) at an angle of incidence of 45°. Part of the beam is transmitted and part is reflected. What is the angle between the reflected and transmitted rays?
gen physics II
A beam of light is incident upon a flat piece of glass (n = 1.50) at an angle of incidence of 45°. Part of the beam is transmitted and part is reflected. What is the angle between the reflected and transmitted rays?
gen physics II
A beam of light is incident upon a flat piece of glass (n = 1.50) at an angle of incidence of 45°. Part of the beam is transmitted and part is reflected. What is the angle between the reflected and transmitted rays?
gen physics II optics
Find the radius of a star image formed on the retina of the eye if the aperture (pupil) diameter at night is 0.70 cm and the length of the eye is 3.1 cm. Assume the wavelength of the starlight in the eye is 500 nm. (1nm=10^9 m)
College physics
According to Newton's Third Law, for every action there is an equal an opposite reaction. If the current on the wire is such so that the magnetic force on the wire points upward, what must be true? 1. There is no force on the magnet. All forces act on the wire to keep the ...
College physics
The magnetic field at the center of a 0.70-cm-diameter loop is 2.4 mT. What is the current in the loop? A long straight wire carries the same current you found in part a. At what distance from the wire is the magnetic field 2.4 mT?
Physics
"A mass of 3.08kg oscillates on the end of a horizontal spring with a period of 0.323s. What acceleration does the mass experience when its displacement is 2.85m to the right?"
College physics
If the force increases when the current increase what can you say about the force on a current element as a function of the current?
College physics
In the image below, you will see a current balance setup where the current I is coming out of the page in between the two poles of the magnet N and S. What is the direction of the magnetic field B in the region where current I is? The Image shows the north pole on the left and...
College physics
According to Newton's Third Law, for every action there is an equal an opposite reaction. If the current on the wire is such so that the magnetic force on the wire points upward, what must be true?
Physics
"Determine the restoring force of a pendulum that is pulled to an angle of 12.0 degrees left of the vertical. The mass of the bob is 300.0g."
Physics
(b)A coin is placed 20 cm from the axis of a rotating turntable of variable speed. This speed is gradually increased and the coin remains fixed on the turntable until a rate of 36 rpm is reached. At this point, the coin slides off. What is the coefficient of static friction be...
physics
Discharging Capacitor For R = 1000 W, C = 2000 mF, Qo= 20 mC. (a)How long will it take before the capacitor discharges to Qo/100. (b)What is the value of current at t = 4 sec. I am completely lost on how to solve this question, please can anyone give me help in the right direc...
PHYSICS
if by some suitable mechanism the falling body had been given an initial downward push instead of just being released, would the resulting value of (g) acceleration due to gravity have been different?why? tnx....please answer it...
PHYSICS
a)speed is the magnitude of instantaneous velocity. Is the average speed equal to the magnitude of the average velocity? Justify b)under what condition is the average equal to instantaneous velocity? c)a car travels 40 mph for 2 hrs and 60 mph for 3hrs.what is the average speed?
gen physics II
Very large capacitors have been considered as a means for storing electrical energy. If we constructed a very large parallel-plate capacitor of plate area 1.0 m2 using paper (k= 3.7) of thickness 1.0 mm as a dielectric, how much electrical energy would it store at a plate volt...
gen physics II
If a doubly-ionized oxygen atom (O–2) is accelerated from rest by going through a potential difference of 20 V, what will be the change in its kinetic energy?
physics
A coin is placed 20 cm from the axis of a rotating turntable of variable speed. This speed is gradually increased and the coin remains fixed on the horizontal turntable until a rate of 36 rpm is reached. At this point, the coin slides off. What is the coefficient of static fri...
Physics
Show that the escape speed n for a body located on the surface of a planet of radius r and mass M is given by the expression v = sqrt( (2* G * M)/r) now im using (K+Ug)i = (K+Ug)k where Kf = 0 because final velocity is zero and Ugf = 0 because its final distance is infinity
Physics
Vincent decided to beat his friend's average velocity of 4 m/s. What is the shortest amount of time to beat his friend's recordin a displacent of 20 meters? *SHOW ALL WORK AND EXPLAIN THOROUGHLY*
gen. physics II
A charge of +3 C is at the origin. When charge Q is placed at 2 m along the positive x‑axis, the electric field at 2 m along the negative ´‑axis becomes zero. What is the value of Q? a. ‑3 C b. ‑6 C c. ‑9 C d. ‑12 C please justify you...
gen. physics II
Two charges, +Q and ‑Q, are located two meters apart and there is a point along the line that is equidistant from the two charges as indicated. Which vector best represents the direction of the electric field at that point? a. Vector EA b. Vector EB C. Vector EC d. The ...
college gen. physics II
38. A proton initially moves left to right long the ´‑axis at a speed of 2 ´ 103 m/s. It moves into an electric field, which points in the negative ´ direction, and travels a distance of 0.2 m before coming to rest. If the proton's mass and charge a...
physics
A proton initially moves left to right long the x‑axis at a speed of 2 ´ 103 m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.2 m before coming to rest. What acceleration magnitude does the proton experienc...
Physics
"Water flows over a section of Niagara Falls at the rate of 1.2*10^6 kg/s and falls 50.0m. How much power is generated by the falling water?" It's a the kg/s that is confusing me. I don't know how to work with it.
Physics
A 1.50 kg snowball is fired from a cliff 13.0 m high with an initial velocity of 14.0 m/s, directed 41.0° above the horizontal. (a) Using energy techniques, rather than techniques of Chapter 4, find the speed of the snowball as it reaches the ground below the cliff. m/s (b...
Physics
The figure below shows a thin rod, of length L and negligible mass, that can pivot about one end to rotate in a vertical circle. A heavy ball of mass m is attached to the other end. The rod is pulled aside through an angle θ and released. (a) What is the speed of the ball...
Physics
Zero, a hypothetical planet, has a mass of 4.0 1023 kg, a radius of 3.0 106 m, and no atmosphere. A 14 kg space probe is to be launched vertically from its surface. (a) If the probe is launched with an initial kinetic energy of 5.0 107 J, what will be its kinetic energy when i...
11th grade Physics
Difference between Atomic spectrum and emission spectrum. First give me the clear cut definition of both and then the difference!!!
physics question
A resistance box has the following components and tolerances: 10 resistors each of 100k§Ù ¡¾ 0.05% 10 resistors each of 10k§Ù ¡¾ 0.05% 10 resistors each of 1k§Ù ¡¾ 0.05% 10 resistors each of 100§&U...
college physics
Hi given you have a half-wave rectifier and you know alternating current = VSin2(pi)fT, how do you calculate V(o)t?
physics
The specific heat capacity of steel is 445 Jkg K. How much energy is required to raise the temperature of a 0.410g of kettle which contains 1.2L of water from 20 degrees Celsius to boiling point?
Physics
I have to design a procedure which allows me to calculate the applied rocket thrust force of a stomp rocket. The only materials I am allowed are stop watches, rulers, measuring tape, protractors and the stomp rocket. Basically it all has to be done mathimatically. I so far hav...
Physics
"A wave travels from one medium to another, and the wavelength decreases. What happens to the velocity and the frequency?" I know that frequency will remain the same, because it is controlled only by the source. But does the velocity decrease? According to Snell'...
Physics
I have to design a procedure which will allow me to calculate the applied force(thrust) of a stomp rocket. We are allowed to use tools to find measurements. So far, I have calculated the height that the rocket reached (22.5) m using trig. (right angle triangle where one angle ...
11th Grade Physics
A rocket is fired vertically from the ground with a resultant vertical acceleration of 10ms^-2. The fuel is finished in 1 minute and it continues to move up. What is the maximum height reached? Solve it!!! N Please solve it as i've to copy it in my correction notebook it&#...
physics
A wheel of mass 0.52kg and radius 46cm is spinning with an angular velocity of 23rad/s. You exert a force F on the wheel, the wheel comes to a stop after 1/4 turn. What is F.
Physics
A machine carries a 3.0 kg package from an initial position of di = (0.50 m) + (0.75 m) + (0.20 m) at t = 0 to a final position of df = (7.30 m) + (11.0 m) + (7.20 m) at t = 14 s. The constant force applied by the machine on the package is F = (2.00 N) + (4.00 N) + (6.00 N) . ...
Physics
(a) At a certain instant, a particle-like object is acted on by a force F = (3.0 N) - (1.0 N) + (8.0 N) while the object's velocity is v = - (2.0 m/s) + (4.0 m/s) . What is the instantaneous rate at which the force does work on the object? W (b) At some other time, the vel...
Physics
An iceboat is at rest on a frictionless frozen lake when a sudden wind exerts a constant force of 220 N, toward east, on the boat. due to the angle of the sail, the wind causes the boat to slide in a staraight line for a distance of 8.5 m in a direction 20° north of east. ...
Physics
A 2.9 kg body is at rest on a frictionless horizontal air track when a horizontal force F acting in the positive direction of an x axis along the track is applied to the body. A stroboscopic graph of the position of the body as it slides to the right is shown in the figure. Th...
Physics
Figure 7-47 shows a cold package of hot dogs sliding rightward across a frictionless floor through a distance d = 21.5 cm while three forces are applied to it. Two of the forces are horizontal and have the magnitudes F1 = 5.00 N and F2 = 1.00 N; the third force is angled down ...
Physics
A machine carries a 4.5 kg package from an initial position of di = (0.50 m) + (0.75 m) + (0.20 m) at t = 0 to a final position of df = (7.60 m) + (12.0 m) + (7.30 m) at t = 11 s. The constant force applied by the machine on the package is F = (2.00 N) + (4.00 N) + (6.00 N) . ...
Physics
Two vectors are given by a = 3.7i + 6.9j, and b = 1.9i + 4.7j. Find (b) a·b = (c) (a + b)·b = (d) the component of a in the direction of b = .
physics
The heating value of a Gas is 39MJm-3 a) If 4.5m-3 of the gas is burned how much energy is released? b) If the gas is burned in 5 minutes what is the power? c) If the burning occurs in an engine that converts the energy to forward motion and the engine is 20% efficient in conv...
PHYSICS
An object has an acceleration of 0 m/s squared. Does this mean that the object must be stationary. Explain. Stationary means that the object does not move. I don't think that the object must be stationary in this case because the scalar zero only tells us that the speed of...
PHYSICS
An odometer in a car has a reading of 50 km at the beginning of a trip and a reading of 125 km half an hour later. What is the average speed of the car? A. 3.75 km/h B. 62.5 km/h C. 1250 km/h D. 250 km/h The only way to find the average speed is to divide the total distance by...
PHYSICS
What is the average velocity between 0.6 h and 1 h? A. + 0.4 km/h B. + 1.25 km/h C. + 1.66 km/h D. + 2.5 km/h This questions is hard for me to understand because you can only find average velocity by dividing the displacement by the time, and here they don't give you displ...
PHYSICS-Help required
My physics questions are not on graphs, this is just a practise quiz I'm doing. All the questions I've done so far were not guessed answers, I did my work on a seperate piece of paper, all I really had to do was divide. The other questions above that I need help on, ca...
PHYSICS-stuck
These are the troublesome questions. What is the average velocity between 0.6 h and 1 h? A. + 0.4 km/h B. + 1.25 km/h C. + 1.66 km/h D. + 2.5 km/h The other question is below. What is the object's displacemnt between 0.4 h and 0.6 h? A. -0.75 km B. +0.25 km C. +0.75 km D. ...
PHYSICS
An odometer in a car has a reading of 50 km at the beginning of a trip and a reading of 125 km half an hour later. What is the average speed of the car? A. 3.75 km/h B. 62.5 km/h C. 1250 km/h D. 250 km/h I say it's D.
PHYSICS
A canada goose flew 860 km from washington to British COlumbia with an average velocity of 30.5 m/s [N]. Approximately how long did it take the goose to make its journey? A. 0.04 h B. 7.8 h C. 28.2 h D. 469.9 h I say C.
PHYSICS
The average velocity of a plane was 600 km/h [N]. How long did it take the plane to travel 120 km? A. 0.2 min B. 5 min C. 12 min D. 5.0 h
PHYSICS
It took 0.45 s for a fastball to reach the batter. If the pitcher is 18 m away from the batter, how fast was the fastball pitch? A. 0.025 m/s B. 8.1 m/s C. 18 m/s D. 40 m/s I say it is D. To let you know; this is not a test, it's only a practise quiz I'm doing.
PHYSICS
How long would a meteor, with a velocity of 45 km/s, take to travel 120 km through Earth's atmosphere to Earth's surface? Assume no atmospheric friction. A. 0.375 s B. 2.66 s C. 45 s D. 5400 s I say B.
PHYSICS
Which two terms represent a vector quantity and the scalar quantity of the vector's magnitude, respectively? A. velocity and speed B. time and time interval C. acceleration and velocity D. position and displacement I say it's A.
PHYSICS
which of the following describes a scalar quantity? A. it has direction only B. it has magnitude only C. it is the size of a quantity D. it has both direction and magnitude I say B.
Physics
"Point S1 and S2 are close sources of circular water waves each of wavelength 6.0cm. P is a point some distance away from the sources. Explain whether the following path differences (path difference = PS2 - PS1) result in nodes or anti-nodes. a) 6.0cm b) 9.0cm c) 18cm d) ...
physics
how much energy is needed to heat 50 grams of ethanol
Physics
A certain spring stretches 6 cm when a load of 30 N is suspended from it. How much will the spring stretch if 41 N is suspended from it?
Physics
"Vibrators A and B are sources of waves with different wavelengths and they are placed close to one another in a ripple tank. Waves from source A have a wavelength of 8.0cm while those from B have a wavelength of 10cm. The waves start out in phase with each other. For eac...
physics
A man (weighing 915 N) stands on a long railroad flatcar (weighing 2720 N) as it rolls at 18.5 m/s in the positive direction of an x axis, with negligible friction. Then the man runs along the flatcar in the negative x direction at 55.00 m/s relative to the flatcar. What is th...
physics
In the figure, a stationary block explodes into two pieces L and R that slide across a frictionless floor and then into regions with friction, where they stop. Piece L, with a mass of 2.0 kg, encounters a coefficient of kinetic friction μL = 0.40 and slides to a stop in d...
physics
A bullet with mass m and a velocity of v is shot perpendicular to the edge of a uniform rod with length L and mass 4m which is free to move and rotate on a frictionless horizontal surface. The bullet is lodged into the rod and move together after the collision. a) Calculate th...
Physics
the engineer of a passenger train traveling at 25.0 m/s sights a freight train whose caboose is 200m ahead on the same track. The freight train is traveling at 15.0 m/s in the same direction as the passenger train. The engineer of the passenger train immediately applies the br...
physics
A 300kg motorboat is turned off as it approaches a dock and it coasts in toward the dock at .5 m/s. Isaac, whose mass is 62kg, jumps off the front of the boat with a speed of 3m/s relative to the boat. what is the velocity of the boat after Isaac jumps?
physics
homework question I have and I dont really understand how to do the problem. Gooluk, the Inuit, is pulling a 62kg sled through the snow on his way home from ice fishing. On the back of the sled is his 50kg sack of fishing tackle. The coefficient of sliding friction between th...
physics
a 10-kg mass is supported by two strings of length 5m and 7m attached to two pints in the celing 10m apart. find the tenion in each string
Physics - Another Question
"A meter stick is held vertically behind an object on a spring. The object vibrates from the 20cm mark to the 32cm mark on the stick. Find the displacement when the object is at the 20cm mark, 24cm mark, 26cm mark, and 30cm mark." I had found the equilibrium position...
Physics
"What happens to the energy associated with a wave after the wave has been damped out?" I'm assuming all the energy is lost by then, am I right?
physics
A road is inclined at an angle of 9 degrees with the horizontal. After driving 10,000 feet along this road, find the driver's increase in altitude?
Physics
A car, of total mass 1200 kg, is travelling at 90 km/h and strikes a tree. The front end of the car compresses and the driver comes to rest after travelling 0.80 m. (i)What was the average acceleration of the driver during the collision? Express the answer in terms of “g&...
Physics
A car, of total mass 1200 kg, is travelling at 90 km/h and strikes a tree. The front end of the car compresses and the driver comes to rest after travelling 0.80 m. (i)What was the average acceleration of the driver during the collision? Express the answer in terms of “g&...
Physics
How much water at 20 degrees C is needed to melt 1 kg of solid mercury at its melting point which is -39 degrees C? (The heat of fusion of mercury is 2.8 cal/gram).
Physics
An old Chrysler with mass 1800 kg is moving along a straight stretch of road at 58 km/h. It is followed by a Ford with mass 1400 kg moving at 70 km/h. How fast is the center of mass of the two cars moving?
Physics
A 1.00 kg particle has the xy coordinates (-1.20 m, 0.500 m) and a 3.00 kg particle has the xy coordinates (0.600 m, -0.750 m). Both lie on a horizontal plane. At what (a) x and (b) y coordinates must you place a 1.00 kg particle such that the center of mass of the three-parti...
Physics
(b) Given that Icm = ½MR2 for a uniform solid wheel, (i) show that the rotational kinetic energy is half the translational kinetic energy for such a wheel. (ii) For the wheel of diameter 10 cm, find its final speed after traversing a distance of 10 m down an incline of...
physics
A constant force of 20N is applied tangentially to a string wound on the rim of a 40 cm diameter wheel, initially at rest. (i) How much work does this force do as it turns the wheel through 45„a? (3 %) (ii) If the wheel has mass 8.0 kg and radius of gyration 15 cm, how lo...
physics
the forces on the table act on a ring but are said to be concurrent. if the cords were rigidly to the ring would the forces necessarily be concurrent?? will you please give me some explanation answers about this...thanks a lot..
pHysics
a rope 26 ft long is attached to two points A and B, 20 ft apart at the same level. A load of 250lb is carried at the middle of the rope. what force is exerted on A. please answer this immediately i need it...thanks a lot...
PHYSICS
Original Q: If you pour liquid into a tall, narrow glass, you may hear sound with a steadily rising pitch. What is the source of the sound? And why does the pitch rise as the glass fills? Additional question from me: What does it mean by the source of the sound? like the tappi...
physics - trans. line
A high-voltage transmission line with a resistance of 0.30 /km carries a current of 1040 A. The line is at a potential of 680 kV at the power station and carries the current to a city located 159 km from the station. (a) What is the power loss due to resistance in the line? b)...
PHYSICS
How do we determine time interval? We determine time interval by subtracting the final time from the initial time.
Physics
How do we determine time interval? We determine time interval by subtracting the final time from the initial time.
Physics
Could you explain to me how it is possible to run a distance of 1.0 km and have zero displacment.
Physics
Explain which would be more useful to you if you needed to locate a buried treasure of the position of the treasure. I'm guessin its the distance, but the position is also very important.
physics
Gooluk, the Inuit, is pulling a 62kg sled through the snow on his way home from ice fishing. On the back of the sled is his 50kg sack of fishing tackle. The coefficient of sliding friction between the sled and the snow is .07 and the coefficient of sliding friction between the...
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