# Math/Physics

208,897 results, page 55

### Physics

a boat sails 150km N60°E, then 100km West. What is it's displacement from its starting point?

### physics

Whn sand is poured on a rotatory disc what happens to its angular velocity. Explain

### Physics

A 62 kg person is skiing down a 37 degree slope that has a coefficient of 0.15. what is their velocity after 5.0 seconds

### physics

An object is projected at an angle of elevation of 45 degree with a velocity of 100 m/s calculate its range

### Physics II

find the pressure at the bottom of a vessel 76cm deep when filled with a) water b)mercury (sp.g. 13.6)

### physics

How much heat energy must be added to a 3.0 cm × 3.0 cm × 3.0 cm block of aluminum to raise its temperature from -50∘C to 50∘C?

### Physics

How much does it cost to operate a 23-W porch light for 24 h if electric energy costs 8¢/kWh?

### Physics

A stone with a mass of 20kg and density of 20,000kg/m3 is immersed in water. Find its weight

### physics

which formular do to use to calculate distace in newton's law if i have height and angle?

### physics

How much work isneeded to stop a 20g bullet moving with a speed of 150m/s

### Physics

Things around you are emitting infrared radiation that includes the wavelength 1.13 10-5 m. What is the energy of the photons?

### Physics

Find speed of sound in air if distance is 170 meters and time is 1.1 second

### Physics

What is the linear acceleration of a point on the rim of a 38 cm-diameter record rotating at 33 1/3 rev/min?

### physics

A positive and a negative charge, each with a magnitude of 1.41 x 10^-5 C, are separated by a distance of 0.44 m. Find the force on each of the particles.

### Physics

A cooking pot contains 0.8kg of water at 100degree celcius what is the specific heat

### Physics

the speed of a train increases from 15 mi/h in a distance of 500 ft. calculate the average acceleration in ft/s squared

### Physics

What is the direction of the displacement of a person who walks 10 km at 37 degrees south of east, then 14 km due west?

### physics

An arc lamp operates at 80V . suggest a method to use it with 240 V d.c. source

### physics

An arc lamp operates at 80V . suggest a method to use it with 240 V d.c. source

### Physics

How long does it take a car to change it velocity from 15m/s if it accelerarate uniformly at 5m/s square?

### Physics

The density of the dead sea is 1240kg/m^-3. Calculate the depth at which the pressure would be 3 atm

### PHYSICS!

Find the gauge pressure in pascals in a soap bubble 0.04 m in diameter. The surface tension is 25.0 x 10^4 Pa.

### Physics

Two instances during which the heating effects of electric current is not required pls

### physics

And and climb up 5 stairs , each of width 20 cm and height 20 cm . Find the distance covered and displacement of ant ?

### Physics 2

What quantity of heat is needed to convert 1kg of ice at -10C to liquid at 20C?

### Physics

The ratio of maximum and minimum magnitudes of the resultant of two vectors a and b is 3:1 now |a| is equal to

### physics

a cricket ball is takes 3 sec to reach the maximum height its initial velocity is???

### physics

How many electron can passes through a cross sectional area of a conductor per second

### Physics PLS HELP

What is the difference between universal gravitational constant and acceleration due to gravity

### physics

Starting from the constant-acceleration kinematic equations, write a formula that gives xf in terms of t, xi, vf, and a. xf

### Physics

How come in the number 5.350, there are 4 significant figures? Is the 0 considered a trailing zero with a decimal?

### physics

a pendulum swing with a speed of 1.5 m/s at its lowest point. How high will it rise before it stops

### Physics

A bike starts from rest and accelerates to 20 m/s over a period of 6 seconds. What is the acceleration of the car?

### Physics

How can an object be a specular reflector for some electromagnetic waves yet be diffuse for others?

### Physics! NEED HELP!

A 40 kg girl runs up a flight of stairs that is 34 m high. How much work does this require?

### math

Show that if x is a nonzero column vector in R^n, then the nxn matrix: A = I - 2/||x||^2 * xx^T is orthogonal. Notation key: ||x|| = norm of x x^T = transpose of x I = identity matrix. Let me try to convince a math student to use "physics" notations that many mathematicians ...

### math(help)

please help me and answers these i feel clueless!with this math 2.If Nell works 3/4 of an hour on Monday and 6/10 of an hour on Tuesday, how much time will she work altogether? A.9/14 hour B.9/20 hour C.1 7/20 hour D.1 7/10 --------------------------- 3.eric eats 1/6 of an ...

### Math

Math Question = an aquarium holds 6 and 1/4 gallons of water. the water level dropped to 4/5 of this amount .how much water should be added to fill the aquarium Above is my son's math question and we can't figure out how to solve it. The possible answers are: 74 and 1/2 / 10 ...

### Physics - General Physics

Violet light and red light travel through air and strike a block of plastic at the same angle of incidence. The angle of refraction is 30.700° for the violet light and 31.380° for the red light. The index of refraction for violet light in plastic is greater than that for red...

### physics

Here's a physics problem. I don't care about the answer, i just want to know how to do it. don't have to be too detailed.. but i don't really kno how to start this 1.) A model rocket blasts off from the ground rising straight upward with a constant acceleration that has a ...

A ball of mass 0.4 kg, initially at rest, is kicked directly toward a fence from a point 20 m away, as shown below. The velocity of the ball as it leaves the kicker’s foot is 16 m/s at angle of 46◦ above the horizontal. The top of the fence is 4 m high. The ball hits ...

### Physics

A 40 gram bullet is fired horizontally from a gun with a momentum of 2.8 (kg*m/s) and embeds itself into a 300 gram block of wood initially at rest on a wooden horizontal surface. After this collision the wood block slides 15 meters before falling off a table with a height of ...

### physics

A 40 gram bullet is fired horizontally from a gun with a momentum of 2.8 (kg*m/s) and embeds itself into a 300 gram block of wood initially at rest on a wooden horizontal surface. After this collision the wood block slides 15 meters before falling off a table with a height of ...

### Math

This is quite confusing... I'm helping someone with math. They have a problem, -4^2, and the people we're both talking to can't agree on whether it's -16 or 16. Google returns -16, my calculator returns 16. Google, however, changes it to -(4^2). I figured it was 16 since -4...

Please check my answer to see if I got it right. Thanks. Braden has 1 hour of math homework to do. He spends 2/5 of this time complaining about how much he hates math, 1/3 of the total time looking for his calculator. How much time does Braden actually work on his math ...

I want to work in the field of zoology when I get older, and I'm filling out an "academic 4-year plan" our counselors gave to my class to complete and turn in on Monday. The science and math I'm taking this year are physics and geometry. Can you take Calculus (a high school ...

### physics- response to bobpursley

which is false? Consider the following processes: I. Energy flows as heat from a hot object to a colder object II. Work is done on a system and an equivalent amount of energy is rejected as heat by the system III. Energy is absorbed as heat by a system and an equivalent amount...

### math

Ben can complete 3 math problems in 20 minutes. If he continues working at the same rate, how long will it take Ben to complete 15 math problems?

### math

Ben can complete 3 math problems in 21 minutes. If he continues working at the same rate, how long will it take Ben to complete 16 math problems? thanks .

### math

Ben can complete 4 math problems in 20 minutes. If he continues working at the same rate, how long will it take Ben to complete 17 math problems?

### Math

Valerie soent 32% study time on math and science. Math @ 3 hrs and Science at 5 hrs. How much time spent on studying subjects?

### math

In an examination 70 student failled in math¡A90failed in science and 20 failed in both. if 80 student passed in math using venn-daigram¡A find how mamy student were passed in both subject¡H

### Physics,Question ,Solved but about Units?

These are “plug-in-the-number” tasks to familiarize you with the main formulas that link the physics concepts of this chapter. They are one-step substitutions, much less challenging than the Think and Solve problems that follow. Average speed ! total distance covered ...

### physics

Long, long ago, on a planet far, far away, a physics experiment was carried out. First, a 0.250 kg ball with zero net charge was dropped from rest at a height of 1.00 m. The ball landed 0.350 s later. Next, the ball was given a net charge of 7.60 muC and dropped in the same ...

### physics 4

help me in this topicsmass vol.relationship,graphs and itinterpretation,vectors and scalars help me more to understand this topics the tools in physics,measurement,vectors and scales It is quite impossible to divine what you don't understand. We can easily critique your ...

### physics

An inquisitive physics student, wishing to combine pleasure with scientific inquiry, rides on a rollercoaster sitting on a bathroom scale. (Do not try this yourself on a rollercoaster that forbids loose heavy packages.) The bottom of the seat in the rollercoaster car is in a ...

### English

What's your favorite class? 1. It's a math class. 2. It's math class. 3. It's math classes. 4. Math class is my favorite. 5. Math classes are my favorite. 6. A math class is my favorite. (Which answers are correct? Are all correct?)

### physics

While standing on 3rd street you hear an approaching ambulance. Its siren oscillates in frequency between about 650 Hz and 750 Hz. Later on as you near your destination, you come upon the scene of the accident. The now-stationary ambulance runs its siren as it's about to drive...

### physics

While standing on 3rd street you hear an approaching ambulance. Its siren oscillates in frequency between about 650 Hz and 750 Hz. Later on as you near your destination, you come upon the scene of the accident. The now-stationary ambulance runs its siren as it's about to drive...

### PHYSICS

ADDITIONAL INO ADDED AT BOTTOM a spectator at a hockey game is sitting in a seat situated 10.4m above ground leve. if the spectator has a mass of 52.6 kg, calculate her gravitational potential energy relative to: a)ground level Eg=mgh =52.6X9.8X10.4 =5360.99J b)the ice surface...

### Math

If a teacher allows 5/6 of an hour to be spent on homework and she allow 1/3 of that time to be spent on math, how much time will be spent on math?

### PHYSICS - VERYYYY IMPORTANT!!!

VERY IMPORTANT FOR A PHYSICS PRESENTATION.. PLEASE HELP & EXPLAIN CLEARLY??? THANKS SO MUCH! (a) why is the centripetal force neede to keep a body moving in a circular path? (b) In what direction does a centripetal force accelerate the body on whic it acts?? (c) Upon what ...

### physics

A large crate filled with physics laboratory equipment must be moved up an incline onto a truck. 1. The crate is at rest on the incline. What can you say about the force of friction acting on the crate? 2.A physicist attempts to push the crate up the incline. The physicist ...

### Physics

Explain what happens to the charge carriers in a semiconductor light dependant resistor when it is illuminated. Suggest why shining light onto an LED might be expected to generate a small voltage between its terminals. Thx A semiconducting light-dependent resistor excites more...

### physics/ math

A student bikes to school by traveling first d_N = 1.10 {miles} north, then d_W = 0.500{miles} west, and finally d_S = 0.200 {miles} south. You will now find the same quantity algebraically, without the need to use much geometry. Take the north direction as the positive y ...

### Physics

I had this question last night for Dr. Bob-A fox sees a piece of carrion thrown from a nest 14 m high and goes to get it. Carrion is thrown 1.5 horizontal velocity. Fox is 7. m from base of tree. What is mgnitude of fox's average velocity if it grabscarrion just as it touches ...

### Social studies?

Please ignore my previous post. I prematurely hit the enter key. I've been watching this board all day, waiting for someone to answer my physics question (no one has yet. sigh.) I just have to say Ms. Sue is my hero. She consistently answers almost every student's questions, ...

### RE: PHYSICS

"Relative" is an important word. Block L of mass mL = 1.90 kg and block R of mass mR = 0.500 kg are held in place with a compressed spring between them. When the blocks are released, the spring sends them sliding across a frictionless floor. (The spring has negligible mass and...

### Research and Statistics

I want to ensure I've done this problem correctly. Thanks! 3. In one elementary school, 200 students are tested on the subject of Math and English. The table below shows the mean and standard deviation for each subject. Mean SD Math 67 9.58 English 78 12.45 One student’s ...

### physics

Assistance required as to why visible light is not emitted when infrared radiation falls on fluorescent materials.

### Physics

A ball rolls off the edge of a balcony at 8.0 m/s. Find its speed after 3.8 s in the air. Use g = 10. m/s2

### physics

Which Law of Motion explains the action-reaction pair of forces. The first, second or third?

### Physics

Calculate the Magnitude of the resultant of a pair of 100-km/h velocity vectors that are at right angles to each other.

### physics

Find the the force the person must exert on the 14.5 kg lawn mower to accelerate it from rest to 1.5m/s in 2.5 seconds?

### physics

a car traveling at 7.0 m/s accelerates uniformly at 2.5 m/s TO REACH A SPEED OF 12.0 M/S HOW LONG DOES IT TAKE FOR THIS ACCELERATION TO OCCUR?

### Physics

Can anyone help? the resistance of the side lights on an automobile are 10 ohms. How much current flows in them when connected to 12 volts

### Physics

How can you easily increase the magnetic field strength inside a current-carrying coil? Could someone help?

### physics

true or false: according to einstein, a gravitational field is equivalent to an accelerating frame of reference.

### physics

a dragster starting from rest accer;ates at 49m/s how fast is it going when it has raveled 325m?

### physics

object kicked at 45 degree and travels 82 m b4 hitting the ground. what was its vo? how long was it in the air? how high did it go? please and thanks

### physics

2.A plank is tilted slowly to an angle of 30 degrees with a 12 pound block on it Find FN, FF and the static friction?

### physics

A 2.8 kg air mattress is 2 m long, .5 m wide, & .1 m thick. What mass can it support in water before sinking?

### Physics

On a dt graph if there is a curve from 1 decreasing to 1.2 in an interval does is the velocity and acceleration + or 9? And is it slowing down or speeding up or neither?

### Physics

An object moves with acceleration given by a = -6t^3 m/s^2. Its initial velocity at t = 0 is 5 m/s. How far will it move before stopping?

### Physics

An object moves with acceleration given by a = -6t^3 m/s^2. Its initial velocity at t = 0 is 5 m/s. How far will it move before stopping?

### physics.

Describe constructive and destructive interference in terms of the combining of crests and troughs and the reesulting amplitude.

### Physics

8. Fire engines used to be red. Yellow-green is now the preferred color. Why the change?

### Physics

How could you use the spotlights at a play to make the yellow clothes of the performers suddenly change to black?

### Physics

Suppose you walk toward a mmirror at 2 m/s. How fact do you and your image approach each other? Explain your reasoning.

### Physics

Your friend says that the wavelength of light waves is less in water than in air. Do you agree or disagree, and why?

### Physics

What are the restrictions on the orbit of a communications satellite if it is to appear motionless in the sky as viewed from any location on earth?

### Physics

Is getting shot considered to be an elastic or inelastic collision if blood shoots out everywhere?

### physics

A 1.00-kg ball is attached to a string of 0.50 m and swung in a horizontal circle with a velocity of 2.00 m/s. Find the centripetal acceleration. ac=v^2/r = 2.00^2/.50 = 8.0 m/s^2

### physics repost

Calculate the force of gravatational attraction between two spheres of mass 10.1 kg and 45.4 kg that are 38.5 m apart. F = G(m1)(m2)/r^2 = 6.67 x 10^-11(10.1)(45.4)/38.5^2 = 2.06 x 10 ^-11 N

### physics 2

If you see a flash of lightnng and it is 3 sec. before you hear the clap, how far away is the storm?

### Physics

Does the de Broglie model assert that an electron must be moving in order to have wave properties?

### physics

the making of polymers is an example of the category of work done by chemists caledd _______ fill in the answeerrr

### applied physics

if a DC motor uses a775 coulombs of charge in 15 seconds,how much current is produced

### physics

a 0.03 mol sample of helium is taken through a cycle. the temperature of state A is 400K. calculate V.

### physics

An electron and a proton that are placed in an electrical field both accelerate equally. True or False?