128,894 results, page 40

### Physics

The particles in the figure below (m1=1.6 kg and m2=3.5 kg) undergo an elastic collision in one dimension. Their velocities before the collision are v1i=12 m/s and v2i=-7.5 m/s. Find the velocities of the two particles after the collision. (Indicate the direction with the sign...

The masses of blocks A and B are 4.5 kg and 3.7 kg respectively. The blocks are initially at rest and are connected by a massless string passing over a massless, frictionless pulley. The system is released from rest. a. What is the acceleration of the blocks? b. What is the ...

### physics. I waited over two days for response

An 800kg police boat slows down uniformly from 50km/h (E) to 20km/h(E) as it enters a harbour. If the boat slows down over a 30m distance, what is the force of friction of the boat? (Hint: you will need to convert the velocities into m/s) please show your work.

### Physics kinematics

An archer shoots an arrow at a 72.0 m distant target, the bull's-eye of which is at same height as the release height of the arrow. (a) At what angle must the arrow be released to hit the bull's-eye if its initial speed is 36.0 m/s? (Although neglected here, the atmosphere ...

### Physics

A sign weighing 500N is suspended at the end of a uniform 300N beam 5m in length, as shown. The beam is attatched to the wall with a hinge, and its other end is supported by a wire. What is the tension in the wire if it makes an an angle of 30o with the beam? Help please. Use ...

### Physics

A gun is shot horizontally from a building that is 10 meters high at a velocity of 220 meters/ second: I need to know what Vx is and Vy along with answering Vx after 3 seconds Vy after 3 second. We were given these equations Vy= Vy0-9.8t y= y0+Vy0t-4.9t^2 x=Vxt ,but I'm still ...

### physics

An electron is moving through a magnetic field whose magnitude is 8.70*10^-4 T. The electron experiences only a magnetic force and has an acceleration of magnitude 3.50*10^14 m/s^2. At a certain instant, it has a speed of 6.80*10^6m/s. Determine the angle (less than 90degrees...

### Physics

A 69kg skateboarder, at rest on a frictionless surface, throws a 4.0kg rock with the velocity given by v=3(i hat)+4(jhat), where the x and y axes are both in the horizontal plane. What is the x component of the subsequent velocity of the skateboarder? WHat is the y component ...

### Physics

A 69kg skateboarder, at rest on a frictionless surface, throws a 4.0kg rock with the velocity given by v=3(i hat)+4(jhat), where the x and y axes are both in the horizontal plane. What is the x component of the subsequent velocity of the skateboarder? WHat is the y component ...

### physics

I have a few questions that i am not too sure how to figure out... 1- as a racing car zooms by you, its pitch decreases by 20%. If the speed of sound is 345m/s, how fast is the car travelling? 2-a person has a threshold of hearing of 5db. another person has a threshold of ...

A charge is to be placed at the empty corner to make the net force at corner A point along the vertical direction. What charge (magnitude and algebraic sign) must be placed at the empty corner if the three charges have the same charge of +7.63 μC?

ok i REALLY am stumped. please help! it is a sequence problem here is the problem.... 120,60,30 __, __, __. if you could give me the rule for this problem and the next 3 numbers that would be so great!!!!!!

I'm really, really, really, sorry but I seriously need help. I can't find a TIMELINE of George Vancouver's special journeys and events. PLEASE HELP ME!!! IT WILL MEAN SO MUCH TO ME!

### science Opinions

i need some of your opinions on this question: how will gasoline being replaced with biofuel from garbages affect you peronally? please write your opinions please

### Math

Help Please! The LCM of two numbers is 60. The GCF of the numbers is 5. One number is 5 more than the other. The numbers are________ and __________ Please help clueless in Massachusetts

### physics

A robot probe drops a camera off the rim of a 245 m high cliff on Mars, where the free-fall acceleration is 3.7 m/s2. Find the velocity with which it hits the ground. Answer in units of m/s. 2)Find the time required for the camera to reach the ground. Answer in units of s. ...

A golfer, standing on a fairway, hits a shot to a green that is elevated 5.33 m above where she is standing. If the ball leaves her club with a velocity of 48.0 m/s at an angle of 35.7 ° above the ground, find the time that the ball is in the air before it hits the green. ...

### Physics

A parachutist relies on air resistance (mainly on her parachute) to decrease her downward velocity. She and her parachute have a mass of 55.5kg and air resistance exerts a total upward force of 620N on her and her parachute. What is the combined weight of the parachutist and ...

### Physics

You and some friends go bungee jumping, but you are afraid of oscillations which go too fast. Which one of these options would provide the slower oscillations? a) Tying two bungee cords to your feet such that each bungee cord is attached to your feet and the object which you ...

en meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115°F. Six months later the temperature has dropped to -2°F.How much space now exists between each rail? (The linear expansion coefficient for steel is 12. × ...

### physics

A hollow cylinder, a solid cylinder, a hollow sphere, and a solid sphere roll down a ramp without slipping, starting from rest. The ramp is 0.25 m high. All the objects have radius 0.035. What are their final speeds? Please show what equation you used and what you plugged in...

### Physics

A small bug is placed between two masses (m1>m2) on a frictionless table. A horizontal force F is applied to either m1 or to m2, as shown. 1) In which case does the bug have a better chance of survival? HINT: Find the force of contact between the blocks in each case. Please...

### Physics

Could someone please help me with my homework problem... a) Give the equation for terminal speed in the variables from Stoke's Law, and the densities of the sphere Ps and the fluid P1. b) Find the viscosity of motor oil (in kg/m/s) in which a steel ball of radius 0.85mm falls ...

### physics

Stuck in the middle of a frozen pond with only your physics book, you decide to put physics in action and throw the 6-kg book. If your mass is 54 kg and you throw the book at 14 m/s, how fast do you then slide across the ice? (Assume the absence of friction. Let the direction ...

### Physics

Stuck in the middle of a frozen pond with only your physics book, you decide to put physics in action and throw the 9-kg book. If your mass is 45 kg and you throw the book at 10 m/s, how fast do you then slide across the ice? (Assume the absence of friction. Let the direction ...

### Algebra Problem

I've gotten confunsed. Please help. Solve: 2y-a = a + 3b ____ ______, for y 3 4 Please show how to solve this. If you mean (2y -a)/3 = (a + 3b)/4 then 2y - a = (3/4) (a + 3 b) 2y = (7/4) a + (9/4) b y = (7/8) a + (9/8) b f(x)=x(squared)-4x+9 solve for x

The active ingredient in the allergy medication Claritin contains carbon (C), hydrogen (H), chlorine (Cl), nitrogen (N), and oxygen (O). Its molecular formula is C22H23ClN2O2. The standard adult dosage utilizes 1.480 1019 molecules of this species. Determine the mass (in grams...

### physics

A cannon with a muzzle speed of 1008 m/s is used to start an avalanche on a mountain slope. The target is 1900 m from the cannon horizontally and 802 m above the cannon. At what angle, above the horizontal, should the cannon be fired? (Ignore air resistance.) Someone help ...

### History

I need help in history. I have to write a 4-5 paragraph essay on world war one, but I need information. Could someone please summarize the main things that happened in world war one? Please don't write an essay, I just need someone to tell me the very important things that ...

### algebra

graph each of the following equations below using their intercepts?. 25x + 50y - 100 = 0 find the intercepts Y intercept is when x is zero x intercept is when y is zero. plot those points, connect the dots. please answer my question with solution. 2y - 8x Please note that we ...

A 63 kg skier encounters a dip in the snow's surface that has a circular cross section with a radius of curvature of 12 m. If the skier's speed at point A in Figure 8-25 is 7.9 m/s, what is the normal force exerted by the snow on the skier at point B? Ignore frictional forces...

### PHYSICS

The launching velocity of a projectile is 20 m/s at 53 degrees above the horizontal. What is the vertical component of its velocity at launch? Its horizontal velocity? Neglecting air friction, which of these components remains constant throughout the flight path? Which of ...

### Physics

A spy satellite is in circular orbit around Earth. It makes one revolution in 6.00 hours. (a) How high above Earth's surface is the satellite? [Answer in Km] (b) What is the satellite's acceleration? [Answer in m/s^2] Please provide a step by step explanation of how you got to...

### Value of a Charge of a Body (Physics 11th Grade)

What is the value of a charge of a body that carries 20 excess electrons? I think that the question asks you to pretend that something is negatively charged by 20 electrons. So I think you take the charge of an electron, which is 1.6 x 10^-19, and multiply it by 20. If you do ...

A 76.3-kN car is travelling at 66.5 mph when the driver decides to exit the freeway by going up a ramp. After coasting 418 m along the exit ramp the car\'s speed is 27.3 mph, and it is h = 10.7 m above the freeway. What is the magnitude of the average drag force exerted on the...

Brittany throws a slingshot pellet directly at a target that is far enough away to take 0.190 s to reach. How far below the target does the pellet hit? Enter m as unit. How high above the target should she aim? Enter m as unit.

### physics

Please help me !!! for solution of this question Water enters a horizontal pipe with a rectangular cross section at a speed of 1.00 m/s. The width of the pipe remains constant but the height decreases. 27.3 m from the entrance, the height is half of what it is at the entrance...

The lowest possible energy for a certain positively charged particle trapped in a box is 2.00 eV. (a) What are the next two higher energies a particle can have? b) Is 30 eV an allowed energy? (c) Is 32 eV an allowed energy? (d) Given the box length is 0.434 nm, what is the ...

### Physics

Three particles A, B, C start from the origin from the same time, A with velocity a along x-axis, B with velocity b along y-axis, C with velocity c in xy plane along a line x=y. What should be the magnitude of c so that they always remain collinear is (a). (a+b)/2 (b). √...

### Physics

A car of mass 422 kg is moving 36.0° North of East at a speed of 15.4 m/s. What is the magnitude of the momentum of the car? (magnitude - how big is it? ignore direction). What is the east-west component of the momentum of the car? I already figured out the first question but...

### Physics

Can you please show me how these answers are reached. A fully loaded Cessna-182 airplane of mass 1290 kg has an engine failure when flying with an airspeed of 139 km/h at an altitude of 2670m on a calm day. It then glides at a constant glide angle (which is the direction of ...

### Physics

A 3.0 kg rock is initially at rest at the top of a cliff. Assuming the rock falls into the sea at the foot of the cliff and that its kinetic energy is transferred entirely to the water, how high is the cliff if the temperature of 1.0 kg of water is raised 0.10 degree celsius. ...

### Physics

Tarzan swings on a 27.0 m long vine initially inclined at an angle of 33.0° with the vertical. (a) What is his speed at the bottom of the swing if he starts from rest? (b) What is his speed at the bottom of the swing if he pushes off with a speed of 3.00 m/s? I tried to use ...

### physics

How many grams of carbohydrate does a person of mass 75 kg need to metabolize to climb five flights of stairs (15 m height increase)? Each gram of carbohydrate provides 17.6 kJ of energy. Assume 10.0% efficiency—that is, 10.0% of the available chemical energy in the ...

### Physics

A race car starts from rest on a circular track of radius 500 m. The car's speed increases at the constant rate of 0.520 m/s2. At the point where the magnitudes of the centripetal and tangential accelerations are equal, find the following. a)speed of the race car (m/s) b)the ...

An aeroplane makes in emergency landing without landing gear. If the aeroplane touches down with a horizontal speed of 60.0ms^-1 and the coefficient of friction for aluminium on asphalt is μ = 0.500, how far will the aeroplane slide before coming to rest? You may assume that ...

### Physics Help

1.9 kg block slides along a frictionless surface at 1.8 m/s. A second block, sliding at a faster 4.5 m/s, collides with the first from behind and sticks to it. The final velocity of the combined blocks is 3.5 m/s. What was the mass of the second block? How do you set this ...

1) You have a protein at 20 ug/ml. Its MW =10,000. What is the concentration in molarity? Show work please! 2) You are asked to make 30 mL of a solution at 0.03M using the 0.10M stock solution. How many mililliliters of water do you use to make this solution? How many ...

### physics

A meter stick is rotated about the end labeled 0.00 cm, so that the other end of the stick moves through an arc length of 6.20 cm. Through what arc length s does the 25.0-cm mark on the stick move? any help, please?

### Physics

Gas is confined in a tank at a pressure of 11.0 atm and a temperature of 25.0 degrees C. If two-thirds of the gas is withdrawn and the temperature is raised to 75.0 degrees C, what is the new pressure of the gas remaining in the tank? Please help!

### Science

Today's fossil fuels began forming 300 million years ago. What allowed the process to begin? A Mammals ate all of the plants B Rainfall eroded huge mountains C Dinosaurs roamed the land D Many huge plants grew, died, and decayed (Broken Link Removed) um a little more help ...

### Linear algebra

Show that the origin is the only equilibrium point of the system? X=ax+by Y=cx+dy Wherea,b,c and d are constants, with ad-bc not aqual to 0(zero) Please show me how to do this problem Please show me the work

### Pre-calculus need help!!

Quadratic Formula 1.) x+6/x=-7 2.) 4x/x+4 + 3/x-1 = 15/x^2+3x-4 3.) x+3/x - 2/x+3 = 6/x^2+3x formula: -B+ sqrt B^2 + (-4)(a)(c)/2a f u only wanted to use the formula it's not necessary though. please help me! it's going to pass tomorrow!! please!

Consider the implicit function ln(xy)-cos^-1(x-1)=x a. Find dy/dx. b. Find y when x = 1. c. Find the equation of the tangent line in slope-intercept form when x = 1. Show steps please! Thanks!

Prove that the integral on the interval [a,b] of x is equal (b^2-a^2)/2 integral a to be (x)dx = (b^2-a^2)/2 using the definition of a Definite Integral. This is the limit of a sum approach. show steps please!!! Thank you!!!

### English

Can somebody Please please help. Identify the usage of each of the following modal verbs. May I use your toilet? Mathew might come to see you later. You really should stop smoking. I must do my homework. Monkeys canâ€™t swim

### hca 270

hey yea i posted earlier and i havent responded can some one please hel[p im confused and am cutting close on assinment because ive got things going on and mixed up can someone please help this is due tonite help

find an expression for the magnitude of the initial velocity that a projectile must possess in order to leave the earth when air friction is negelcted. The gravitational constant is given as G= 6.67428*10^-11 m^3 kg^-1 s^-2 Please give lots of details in answer

### us history

Evaluate the extent to which the Articles of Confederation were effetive in solving the problems that confronted the new nation. Does anywone know where I can find the answer to this? I have to type a whole page on it so I need a lot of information... please and thank you! No ...

Which of the following is not considered part of the "golden age" of microbiology? A.First artificial vaccine is developed B.Gram stain is devised C, Viruses are defined D.all of the above Please do not guess I chose C but i think it was wrong

### PHYSICS- PROJECTILE MOTION

A physics book slides off a horizontal table top with a speed of 1.90 m/s. It strikes the floor after a time of 0.410 s. Ignore air resistance. a) Find the magnitude of the horizontal component of the book's velocity just before the book reaches the floor. b) Find the ...

Please help me with the following: Read the sentence. Juanita used her affinity for numbers to help her design a computer program that relied on college-level math formulas, even though she was only in middle school. Based on the context clues in the sentence, what is the best...

A wheel on a game show is given an initial angular speed of 1.33 rad/s. It comes to rest after rotating through 3/4 of a turn. (a) Find the average torque exerted on the wheel given that it is a disk of radius 0.76 m and mass 6.4 kg. ? N·m sorry, I'm having converting issues...

### Physics

In stars, nucleons (protons and neutrons) form nuclei of atoms via a series of fusion reactions. If for a particular fusion reaction more energy is given off than is required to make it proceed, does the final nucleus have a higher or lower rest mass than the sum of the rest ...

### Physics Gravity

A projected space station consists of a circular tube that will rotate about its center (like a tubular bicycle tire) as shown in the figure . The circle formed by the tube has a diameter of about 1.1-km What must be the rotation speed (revolutions per day) if an effect equal ...

### physics

Participants in a road race take water from a refreshment station and throw their empty cups away farther down the course. If a runner has a forward speed of 6.20 m/s, how far in advance of a garbage pail should he release his water cup if the vertical distance between the lid...

### Physics

Know matter how i work it out, i keep getting the wrong answers. please help!!! i only have two more submissions before it closes on me. A sample of blood is placed in a centrifuge of radius 14.0 cm. The mass of a red blood cell is 3.0 x 10^-16 kg, and the magnitude of the ...

### Physics

no matter how i work it out, i keep getting the wrong answers. please help!!! i only have two more submissions before it closes on me. A sample of blood is placed in a centrifuge of radius 14.0 cm. The mass of a red blood cell is 3.0 x 10^-16 kg, and the magnitude of the force...

### Physics

Someone please help. A radio needs to be tuned to a range of values between 526.5 - 1606.5 kHz. Choose a combination of inductor and variable capacitor values within a tuned circuit that would meet this requirement. Choose practical components from standard vendor web sites (e...

Hello, could you guys let me know if this looks right? Thanks in advance. A ball is fired at a speed of 8 m/s at 20 degrees above the horizontal from the top of a 5m high wall. a) what is the total velocity at the maximum height? b) how far from the launcher will the ball hit ...

### Physics

A +33.0 nC charge is placed at the origin of an xy-coordinate system, and a −25.0 nC charge is placed at the point (1.500 m, −0.0540 m). (a) Determine the magnitude and the direction of the force that the positive charge exerts on the negative charge. Use ijk notation for ...

### physics

a physics book has a height of 26cm, a width of 23cm, and a thickness of 3.9cm. what is the density of the physics book if it weighs 17N? the acceleration of gravity is 9.81m/s^2. answer in units of kg/m^3 i know density=mass/volume but it says to answer in units of kg/m^3... ...

### Physics

is physics neccessary for becoming a pharmacist or no? i searched the web and it says yes. so is it true?

### physics

do you know where I can get a formula sheet for physics our book does not include a break down of them

### physics

what are imp. long questions of 7th chapter of 9 e.m of physics of bise lahore.

### Physics

a 12 kg physics book flies through the air with a momentum of 20kg m/s. what is its speed?

### physics

Thank you Henry for helping me with my physics problem about the angle etc and the golf ball on 7/28.

### physics

explain the physics principle why the size of tree stem decreases upwards?

### Physics

A ball is thrown toward a cliff of height h with a speed of 27m/s and an angle of 60 degrees above horizontal. It lands on the edge of the cliff 3.0s later. What is the height of the cliff? What is the maximum height of the ball? What is the ball's impact speed? Please provide...

### physics

Please help with these problems. Thanks! Suppose the circumference of a bicycle wheel is 2 meters. If it rotates at 1 revolution per second when you are riding the bicycle, then your speed will be? Suppose you're on a Ferris wheel at a carnival, seated 10 m from the Ferris ...

A solid disk with a mass ok 100 kg and radius of 0.2m turns clockwise through an angular displacement 10 rad when starting from rest attain its maximum angular speed of 1 revolution every 0.5s. How much time did it take for the disk to go from rest to maximum angular speed?

A cube of wood and a cube of concrete, each 0.17 m on a side, are placed side by side. One of the long faces of the rectangular prism formed by the two cubes is held at 17°C, and the opposite long face is held at 32°C. What is the total rate of heat transfer through the cubes?

A rock is thrown horizontally off of a cliff. It starts with a velocity of 4.2 m/s and the cliff is 68.2 m high. How long does the rock fall? I got 3.7 seconds but I do not know if it is right. (Help on these two) How far out from the bottom of the cliff does the rock fall? ...

### Physics

Kati observes a force of 15 Newtons stretch a spring a distance of 0.450m. a) what is the elasticity coefficient of the spring and b) how much force must be done to stretch the spring a distance of 0.750m? a) F=Kx 15=K(0.450) 15/0.450=k 33N=k It seems off to me know sure if ...

A 5.0-kg block is at rest on a horizontal floor. If you push horizontally on the 5.0-kg block with a force of 10.0 N, it just starts to move. (a) What is the coefficient of static friction? (b) A 12.0-kg block is stacked on top of the 5.0-kg block. What is the magnitude F of ...

A diver stands on the end of a diving board as shown in the figure on the right. The mass of the diver is 58 kg and the mass of the uniform diving board is 35 kg. Calculate the magnitudes and directions of the forces exerted on the board at the points A and B. (A & B are 1 ...

### Physics

Please check my answers: Why does a brick weigh 1 kilogram. Explain. -Is it because the matter in the brick is the gravitational pull between the brick and the earth? When one water drop falls from a facet, and then a few minutes later another drop. How will the drop come out...

### physics

a skater with an initial speed of 7.60m/s is gliding across the ice. air resistance is negligible. (a)the coefficient of kinetic friction between the ice and the skate blades is 0.100. find the deceleration caused by kinetic friction. (b)how far will the skater travel before ...

### Physics

Please explain to me how to do this question!!!!!!! A beam consists of singly ionised neon-20 atoms all travelling at the same speed, 3*10^5 m/s, through a vacuum. As the beam passes through the magnetic field it follows a circular path of radius 0.125m. The force on each of ...

### Physics

Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed. The radius of the orbit is 2.26 × 10-11 m. Determine the magnitude of the electron's ...

### physics (urgent)

onsider the following velocity time graph: (I sent a separate link of the picture as it wouldnt allow me to send it in this box) a)Describe the motion of the object from time t_0 to time_1. b)List two pieces of information (other than speeds or velocities) that can be obtained...

### Physics

1. A snowboarder of mass 60 kg is at rest on the top of a sand dune. The coefficients of static and kinetic friction are 0.55 and 0.4675, respectively. 60 kg μk = 0.4675 μs = 0.55  What is the angle  the incline must exceed so that the snowboarder starts sliding? The ...

### physics

meaning of graw I have never heard that term in physics.

### physics

Come up with 10 things (like bowling) that could use physics? What does this mean?

### Physics

How do observations of the photoelectric effect conflict with the predictions of classical physics?

### physics dicussion question

is there any physics teachers available to help right now?

### physics

why is it cold in winter and hot in summer basing on physics knowledge

### physics

explain the physics concept to why a ship sounds when moving in water?