# physics please HELP !

74,851 results, page 79-
## physics

Charge polarization is normally produced by ____________________. A) nuclear interactions.B) contact.C) induction.D) friction.E) electrostatic means. -
## Physics

A typical lightning flash delivers about 27C of negative charge from cloud to ground. How many electrons are involved? -
## Physics

Two ants race across a table 58cm long. One travels at 4.8 cm/s and the other at 3 cm/s. When the first one crosses the finish line, how far behind is the second one? Answer in units of cm -
## Physics

A bullet fired target loses half of it velocity in penetrating 15cm .how much further it will penetrate before coming to rest -
## Physics

are water waves at the beach with a velocity of 1.75m/s and a wavelength of 3.213 and frequency of 1/1.84Hz considered fast? -
## physics

What force should the woman in Figure 9.45 exert on the floor with each hand to do a push-up? Assume that she moves up at a constant speed. -
## physics

a box of treasure with a mass of 92 kg and volume of 0.031metrecubic lies at the bottom of the ocean.how much force is needed to lift it? -
## Maths, physics, chemistry,

The weight of H2C2O4.2H2O required to prepare 500 ml of 0.2N solution is a)126g b)12.6g c)63g d)6.3g -
## Physics

Show that 480 W of power is expended by a weightlifter when lifting a 60-kg barbell a vertical distance of 1.2 m in a time interval of 1.5 s. -
## physics

If two stones projected from the same point with the same speed but at angles pi/3 and pi/6 respectively have their ranges R₁ and R₂ then a)R1=2R2 B)R1=R2 C)R1=5R2 D)R1=25R2 -
## Physics

If you look at yourself in a shiny Christmas tree ball with a diameter of 10.5 cm when your face is 35.0 cm away from it, (a) where is your image? (b) Is it real or virtual? (c) Is it upright or inverted? -
## physics

A loaded truck can accelerate at 3.2 m/s^2 It loses its load so that it is only 0.2 as massive. By what factor must the acceleration change for the same driving force? -
## physics

Any ideas? A bird flying at 3m/'s west is given an acceleration of 1ms after five seconds what I'd it's velocity and how far has it travelled from its starting point? -
## Physics

An olympic hurdler is in a race. He is running at 10 m/s and jumps over a hurdle. How high did he jump if he was moving at 1m/s as he crossed the fence? -
## physics

three point charges are located at the corners of a right triangle where q1=q3= 5uC,Q2= -2uC and r =10cm.(angle q1 q2q3=90 and q1q3=r) -
## physics

If a trapeze artist rotates once each second while sailing through the air and contracts to reduce her rotational inertia to one-third of what it was, how many rotations per second will result? -
## Physics

Sky divers falls out of a plane at an altitude of 11750 m. How much time in seconds will they pass before they deploy their parachutes? -
## Physics Project

I was wondering what would be some advantages of having a spherical shaped object travelling through air and/or water, as opposed to other shapes? -
## Physics

Two tuning forks are struck at the same time; one with a pitch of 410Hz one a frequency of 500Hz. How many pitches do you hear and what are the frequencies? -
## Physics

What is the magnitude of buoyant force acting on a 720 cm^3 toy submarine floating in fresh water? (D_water =1 g/cm^3) -
## physics

An aeroplane lands on the runway at velocity 180km/hour and decelerates at 0.4 m/s^2 find the time taken until it stops and the displacement. -
## Physics

Your swimming pool is square and 4.9 m on a side. It is 3.9 m deep in the morning. If the temperature changes by 44°C during the afternoon, how much does the depth of the water increase? -
## Physics projectile

If a body projected vertically upwards, give a graph showing variation in its kinetic energy -
## Physics

A body travels from rest with acceleration 8m/s(squared)Find its velocity when it has covered a distance of 100 meter? -
## physics

three point charges are located at the corners of a right triangle where q1=q3= 5uC,Q2= -2uC and r =10cm.(angle q1 q2q3=90 and q1q3=r) -
## Physics

Standing on a bridge, you throw a 3.0 g stone straight upward with speed of 2.5 m/s. How long does it take to return to the original position? -
## physics

Given x(t) = xm cos 2ðt/T for a spring with constant k and attached mass m sketch as a function of t, (a) the displacement x, (b) the velocity v, (c) the acceleration. -
## physics

During an Olympic bobsled run, the Jamaican team makes a turn of radius 7.6 m at a speed of 96.6 km/h. What is their acceleration in terms of g? -
## physics

How far should and object be from a concave sperical mirror of radius 36cm to form a real image one-ninth it's size? -
## physics

Determine the force of interaction between 2 electric charges q1= 1x10-6 C and q2= 2x10-6 C at the distance r = 2 m. I think the formula is F=kq1*q2/r2? How do I find k? -
## physics

a robot drops a camera off the rim of a 239 m high cliff on Mars, where the free-fall acceleration is 3.7 m/s -
## physics

With what tension must a rope with length 2.70 and mass 0.150 be stretched for transverse waves of frequency 43.0 to have a wavelength of 0.850 ? -
## Physics

A car is backing up at a rate of 10km/hr. If the driver looks through his rear-view mirror, how fast does a tree, which is behind him, appear to approach him? -
## physics

How do the pressure variations with depth affect our ability to explore the ocean? Consider the challenges of scuba diving and submarines. -
## Physics

Two planes approach each other head-on. Each has a speed of 765 km/h, and they spot each other when they are initially 11.0 km apart. How much time do the pilots have to take evasive action? -
## physics

two ropes are tied on a post and applied with forces of 8 and ion.If the amgle between them is 60degrees. Find the resultant vector -
## physics

How long does it take for the ball to hit the ground 7 meters below if it's thrown straight up wit intial velocity of 2 m/s squared? -
## Physics

A Ferris wheel has a radius of 14 m. What period of rotation would give the occupants a feeling of "weightlessness" at the top? __s -
## Physics

A red colored ball tossed upward reaches a maximum height of 3.0m. show that the initial speed is 7.7m/s^2. -
## Physics

If a space station must "provide one sixth the magnitude of the acceleration due to gravity on Earth" Can I use 9.81ms^-2/6 or is that too simple? Thanks. -
## physics

A car accelerates uniformly from rest to a speed of 21.2 km/h in 8.3 s. Find the distance it travels during this time. Answer in units of m -
## Physics

A body is projected at angle of 30 degree with the horizontal at an initial speed of 200m/s.how far from the point of projection will it strike -
## Physics

How much energy is stored in a 2.90-cm-diameter, 14.0-cm-long solenoid that has 200 turns of wire and carries a current of 0.790 ? -
## physics (vector)

the direction of forces 1n,2n,3nacting at a point are parallel to the sides of an equilateral triangle.the magnitude of the resultant is what? How -
## physics

What constant net force is required to bring a 1500 kg car to rest from a speed of 100 km/h within a distance of 55 m? -
## physics

If a 2000 pound train tilts of a 20 foot cliff at a 135 angle how long will it take to reach the ground? -
## Physics

Hi! Ijust have one question that I don't know how to do: (a)How long will it take a freely falling body to acquire a speed of 58.8 m/s^2.(b) How far will it have fallen during that time? -
## physics

a car traveling at 7.0 m/s accelerates uniformly at 2.5 m/s to the 2nd power to reach a speed of 12.0 m/s. how long does it take for this acceleration to occur.? -
## physics

Marks: 2 The emf produced in a generator is What is the frequency of rotation of the circular coil? Choose one answer. a. 100 Hz b. 60 Hz c. 50 Hz d. 25 Hz -
## Physics

A police cruiser is travelling at 24 m/s and slows down at a rate of 0.65 m/s2 until it stops. The distance traveled by the cop while slowing down is closest to -
## physics

A car is heading towards a brick wall at 80 km/hr, he starts breaking 30 feet away. What acceleration is required to avoid a collision? -
## AP Physics<<help

A 1.7 kg bundle starts up a 30 degree inlcine with 105 J of Kinetic Eneergy, How far will it slide up in the plane if the coefficient of friction is .3 ? -
## Physics

A 84.0-kg airplane pilot pulls out of a dive by following, at a constant speed of 163 km/h, the arc of a circle whose radius is 312.0 m. -
## Physics

Find the speed of a pendulum bob at the bottom of its swing if its initial displacement is 5.34o and its period is 2.534 s. -
## Physics

What angular speed (in revolutions/second) is needed for a centrifuge to produce an acceleration of 1000g at a radius arm of 15.0cm? -
## physics

If a cyclist traveling at 14.0m/s skids to a stop in 5.60 s, determine the skidding distance assume uniform acceleration? Answer is 39.2m -
## Physics

A car requires velocity of 36 km/h in 10sec just after the start . It takes 20sec to stop . Calculate the acceleration in both the cases . -
## Physics

The highest that George can suck water up a very long straw is 2.0 m. (This is a typical value.) What is the lowest pressure that he can maintain in his mouth? -
## Physics

A soccer player launches a ball at an angle of 40 degrees, with an initial velocity of 23 m/s. What are the horizantal and vertical for this problem?? -
## PHYSICS

A SPRING WITH A CONSTANT K = 8N/m IS STRETCHED 5CM AND RELEASED. IT BOBS UP AND DOWN EVERY 2.5 SECONDS. WHAT IS ITS FREQUENCY, PERIOD, ABD AMPLITUDE -
## physics

calculate the momentum ofa toy car weighing 200 gram and moving with a velocity of 5meter/second? -
## physics

A boy moves 5km eastward and then change his direction towards westward in 4km.calculate his resultant displacement -
## Physics help!

The range of human hearing extends from approximately 20 Hz to 20,000 Hz. Find the wavelengths of these extremes at a temperature of 2°C. 20 Hz? 20000 Hz? -
## Physics

Measurements can be described as accurate and/or precise. Define accuracy and precision and give examples of how those terms could be used to describe a measurement. -
## PHYSICS

A stone propelled from a catapult with a speed of 50m/s attains a height of 100m.Calculate:(a)the time of flight? -
## physics

A softball bat is rotating at 460 rotations per minute at contact with the ball. What is the angular velocity in radians? -
## physics

How much heat is needed to raise the temperature of 0.800kg ethyl alcohol from 15celsius to its boiling point at 78.3celsius? -
## physics

which one of the property is true for mirror 1-refraction 2-refletion 3-communication 4-measuring length 5-gravity 6-heating object -
## Physics

A 3kg block is resting on a table with a coefficient of friction of 0.4. It is now pushed with a force of 15n. What is the acceleration of the book? -
## physics

A uniform steel chain 20 m long and with a mass of 5 kg per m, hangs vertically. Compute the work required to wind it up -
## physics

a man holds a child on his shoulders while watching a football match. How much work has he done if the game lasts for 2 hours -
## Physics

a major league outfielder throws a baseball horizontally with a velocity of 22 m/s, released from a height of 1.8m. how far does it go before it hits the ground ? -
## Physics

George drops a stone from atop a cliff of 25m. How long does it take to hit the ocean below, what velocity is it travelling when it gets there? -
## Physics

please help: "george drops a stone from atop a cliff of 25m. How long does it take to hit the ocean below, what velocity is it travelling when it gets there?" -
## physics

i need help with this one! A 100KHz oscillator that's followed by a doubler and two triplers will produce an output of frequency.... a.) 180 kHz b.) 500 " c.) 800 " d.) 1.8 " -
## Physics

A copper ball 2 cm in radius is heated in a furnace to 400 degree celsius. if its emissivity is 0.3, at what rate does it radiates? -
## physics

what is the length of the shortest pipe closed on one end that will have a fundamental frequency of 60 hz on a day when the velocity of sound is 340 m/s? -
## Science Physics

You walk 30 m south and 30 m east. Find the magnitude and direction of the resultant displacement both graphically and algebraically -
## physics

a long jump athlete take off at 25 degree with the horizontal and achieves a jumping distance of 9.12 m. Calculate initial take off speed. -
## physics

a uniform plank of lenght 5m and a mass1kg support two masses of 500g and 300g . determine the centre of gravity -
## physics

A vector representing 170 N is oriented at 30 degrees with the horizontal. What is the magnitude of the vertical component? Answer in units of N, -
## physics

a toy moves on a horizontal surface with a speed of 3m/s.it makes 8 turns in 5 seconds,whats the diameter of the wheel? -
## Physics B

A car slows down from 23 m/s to rest in a distance of 85m. What is its constant acceleration? I got -6.224, but a friend was telling me it's -3.11 and that I had to divide by 2. Why is that? -
## physics (pendulums)

i understand the PE and KE and MKE points and how gravity effects a pendulum, but how does kenetic and potential energy effect it? -
## Physics

Which of the following physical properties can be used to measure temperature using a thermometer? A. volume B. pressure C. density D. viscosity I think the correct answer is D? -
## Physics

What is the critical angle of light traveling from benzene (n=1.501) into air? 40.05o 48.22o 41.78o 62.63o -
## physics

for an 84 kg person standing at the equator what is the magnitude of angular momentum about the earths center due to earth's rotation -
## PHysics

What is the total energy of a 15-kg mass attached to a spring oscillating horizontally with an amplitude of 20 cm and an angular frequency of 32 rad/s? -
## physics

A bat at rest sends out ultrasonic sound waves at 51.1 and receives them returned from an object moving directly away from it at 22.3 . -
## physics

A car of mass 500kg and velocity=36km/h and suddenlybreak applied 150m calculate the force and work done? -
## PHYSICS

What is the magnitude of the electric field between two large parallel plates 2.0cm apart if a potential difference of 450 V is maintained between them? -
## physics

Calculate the cost of operating a 65 W light bulb continuously for a 30-day month when electrical energy costs $0.23/kW·h. $ 1 -
## Physics

A 70-kg ancient statue lies in the bottom of the sea. It’s volume is 3.0 x 10 4 cm 3 How . much force is needed to lift it? (Use g=10 m/s 2 and the density of water is 1.0 x 10 3 kg/m 3 -
## College Physics

A 750 kg rocket accelerates straight upward from the ground at 60 m/s2. What is the force (thrust) provided by the engine? -
## Physics

It takes you 9.5min to walk with an average velocity of 1m/s to the north from the bus stop to the museum entrance. What is your displacement? -
## physics

Find the wavelength (in nm) of a photon whose energy is 5.90 x 10-19 J. I understand that I have to use this equation to figure out the problem E=nhf, I just keep getting the wrong answer. Which is 33.68 nm -
## physics

what is reaction product when ethene is treated with steam using phosphoric acid as catalyst at 300 degrees celcious -
## physics

Two freight cars, each with a mass of 3.9 105 kg, collide and stick together. One was initially moving at 3.2 m/s and the other was at rest. What is their final speed in m/s? -
## physics

Two freight cars, each with a mass of 3.9 105 kg, collide and stick together. One was initially moving at 3.2 m/s and the other was at rest. What is their final speed in m/s? -
## physics

A ball is thrown directly downward with an initial speed of 8.95 m/s, from a height of 29.0 m. After what time interval does it strike the ground?