# physics please HELP !

74,851 results, page 65-
## physics

what is the wavelength of radar waves with the frequency of 6.0*10^10Hz? a. 0.0010m b.0.010m c.0.050m d.0.0050m -
## Physics

State the reason why a steel sphere resting on a horizontal surface is said to be in neutral equilibrium. -
## physics

Figure 18-23 shows three linear temperature scales, with the freezing and boiling points of water indicated. -
## physics

A stone is projected vertically upward with a speed of 20 m/s. a. What is its velocity at the end of 2s? b. What is the height reacted after 2s? -
## physics

A 4.53 kg particle has a velocity of vx = 3.98 m/s and vy = −3.16 m/s. Find the magnitude of its total momentum. Answer in units of kg · m/s -
## Physics Science

How many kilocalories of heat are required to melt 20.0 kg of ice at 0°C? Okay so the given is m=20.0kg Ti=0°C HeatFusionIce=80 kcal/kg -
## physics

A kettle brings water to boil by using 233 C of charge over the course of 1.25 minutes. The amount of current that was used is _.__ A? -
## physics

Explain why helicopters need 2 rotors to fly in a straight line. Talking about centripetal force. -
## physics

with a cart of unknown mass, could you still determine whether its total energy is conserved? explain your reasoning -
## physics

a 60kg sprinter accelerates from rest at 2.5m/s east for 4s. what force is acting and what is his final speed? -
## Physics

Two objects are near a bar magnet. One is about 1 cm away, while the other is 6 cm away. Compare and contrast the magnetic force that affects each object. What do they want me to do? -
## 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

1. Could a horizontal axis of rotation be used satisfactorily in an experiment uniform circular motion? Explain -
## physics

A skater is gliding along the ice at 2.2 , when she undergoes an acceleration of magnitude 1.2 for 3.0 . At the end of that time she is moving at 5.8 -
## physics

Find the acceleration of the two blocks sliding down the incline in the figure below. (Take m1 = 1.1 kg and m2 = 1.8 kg. Indicate the direction with the sign of your answer -
## physics/math

If you are driving 116 km/h along a straight road and you look to the side for 3.0 s, how far do you travel during this inattentive period? -
## physics

ok so dr= 2i + 3j while F= 5i + 2j It wants me to find the work. now i know w=Fxdr. what i want to know is why when you take the dot product of both, you get a different answer compared to when you just multiply the magnitudes. -
## physics

a boy pulls a bucket of water of mass sky from a well of depth 10 cm calculate the work done ? -
## Physics

A skydiver has a terminal velocity of 9.0 m/s. If they have a mass of 98, what is their k value for their air resistance? Use g = 10 m/s/s and do not report units on your answer, they should be N s/m. -
## physics

two equal vectors of magnitude 2A are inclime perpendicular to each other find the resultant and direction of vector. -
## Physics

What's the tangential acceleration of a freely swinging pendulum when it makes an angle θ with the vertical? -
## physics

An object experiences an impulse, moves and attains a momentum of 200 kg m/s. If its mass is 50 kg, what is its velocity? -
## ap physics

a 37.4-kg traffic light is supported by two wires prove you answer applying newtons law -
## physics

A yo-yo of radius 10 cm and mass 1 kg is dropped from rest. What is the instantaneous torque on the yo-yo if I hold the string with my fingers? -
## Physics

At a spot in the ocean, the surface irradiance is 7.8*10^16 photons and k=.14 m^-1. At what depth does the euphotic zone end? -
## physics

a 50 gram object is accelerating at a rate of 5 m/s2. calculate the force needed to produce this acceleration -
## Physics

What coefficient of friction is required to stop a hockey puck sliding at 12.8 m/s initially over a distance of 66.5 m? -
## Physics

a truck is traveling in a straight line goes 60km in 83minutes. what is its average speed in km per hour? -
## AP Physics

What is the potential energy of an electron and proton in a hydrogen atom if the distance between them is 5.3*10^-11? ANSWER k=9*10^9 Q=1.6*10^-19 q=1.6*10^19 Ue=? Ue=KQq/r Ue=-4.4*10^-18 j -
## Quantum Physics

An electron drop to what energy level is likely to emit a photon in the infrared region? -
## Physics

I don't understand how to do this : A force of 40 N accelerates a 7.17 kg block at 6.0 m/s2 along a horizontal surface. Determine the normal. -
## Physics

A guitar string has a mass of 30g and length of 2m. Find the tension if its density is 0.2kg/m^3 -
## Physics

the co efficient of friction of a plane inclined at 30 degree is 0.4 . Then the acceleration of the body sliding freely on it is? -
## physics

a 333 hz and 337 hz tuning forks are struck simultaneously. whats will be the beat frequency? -
## physics/electrical circuits

if there are eleven resistors of 33k ohms each in parallel, what is the total resistance? -
## physics

A hunk of cast concrete with a weight of 10 N will float if it displaces 10 N of water true or false -
## AP Physics B

What is the force of Friction as a 12 kg object slides down for 30 meters down a 30 degrees incline at a constant velocity? -
## Physics

why do photoelectrons emitted from a metal surface has energy distribution for an incident radiation of frequency? -
## Physics

What coefficient of friction is required to stop a hockey puck sliding at 12.8 m/s initially over a distance of 66.5 m? -
## PHYSICS

lIST THE PARTICLES THAT MAKE UP AN ATOM. wHAT ARE THEIR CHARGES? hOW ARE THEY ARANGED? wHAT IS THE APPROXIMATE AMU OF EACH PARTICLE? -
## physics

how much time does it take for a student running t an average speed or 5.00m/s to cover a distance of 2.00km? -
## Physics

If your hands are wet and no towel is handy, you can remove some of the excess of water by shaking them. Why does this get rid of it? -
## physics

with what velocity must a ball be thrown in order to achieve the height of 50 ft.? and how long will it stay in the air? -
## Physics

Calculate the energy evolved when 8 droplets of water of radius 1/2mm each combine into one where s=0.072N/m. -
## Physics

Assume the distance axis is linear and da = 10.0m and db = 35.0 m. Estimate the work done by a force F in moving a 2.80 kg object from da to db. -
## physics

Which phase of matter consists of particles that are locked into place and unable to move past each other? -
## Physics

Express the angular velocity of 36 rpm (revolutions per minute) in units of radians per second (rad/s). -
## physics

Calculate the extension that would be produced by a 20N force if 15N extends a spring by 3cm -
## physics

A stone is thrown straight up. To reach a height of 6.74 m above its release point, what must its initial speed be in m/s -
## Physics

What is the strength of the magnetic field a distance of 1 meter from a wire carrying a current of 1 A? B=MoI ------ 2(pi)r Mo=4(pi)x 10^-7 I=1 A How do I know what r is? -
## physics

A cara accelerates uniformly from rest to a speed of 21.9 km/h in 8.5 s. Find the distance it travels during this time. -
## Physics

Initial velocity is 21 m/s, the angle is 40 degrees, 20 meters away from the wall. How long is the ball in the air for? -
## Physics

What is the maximum total force exerted on a 71 kg astronaut by her seat during the launch of the Space Shuttle? -
## fristyear physics

two girls a and b weighting 40 and 30 kg both of them pull 14m held by them.they will meet when covers a distance of? -
## physics

a tsunami originating in japan has a wavelength of 10^5 m and a period of 10 mins. how long does it take to travel 8000km? -
## Physics

How many coulombs pass through a wire that carries a current of 3.2 A for 5.0 h? I=Q/t Q=It Q=3.2*5*60 Q=960 I am told this is not the correct answer. -
## physics

find the resistance of 134m of No.20 copper wire at 20 degrees C (p=1.72x10^-6Ohom cm , A= 2.07x10^-2 cm ^2) -
## Physics

Calculate the radial acceleration of an object on the ground at the earth's equator in m/s2, turning with the planet. -
## Physics

A ball falling from rest is located 45 m below its starting point 3.0 s later. Assuming that its acceleration is uniform, what is its value? -
## physics

the density of a block of wood with a colume of 50 cubic centimeters and a mass of 10o grams is -
## physics

You should expect concrete to have an elastic constant that is _____ than wood. a. larger than b. smaller than c. equal to -
## Physics

Katie kicks a football at a 52 degree angle and a velocity of 31 m/s. At what times will it be 10 meters off the ground? -
## Physics

How long will it take a 1080 W motor to lift a 330kg piano to a sixth-story window 16.0m above? -
## Physics

How long will it take a 1080 W motor to lift a 330kg piano to a sixth-story window 16.0m above? -
## physics

Two equal point charges of +3.00 * 10^ -6 C are placed 0.200 m apart. What are the magnitude and direction of the force each charge exerts on the other? -
## Physics

How long will it take a 1080 W motor to lift a 330kg piano to a sixth-story window 16.0m above? -
## Physics

a coin is placed on a stereo revolving at 33.3 revolutions per minute. what is its centripetal acceleration when it is placed 5 cm from the center of the turntable? -
## physics

need help decomposing theses vectors to x and y 52.9 meters at 19 degrees rectangular cor-ordinate system -
## physics

What is the relationship between the coefficient of friction and the time that it takes the object to reach the bottom of the ramp? -
## Physics

Does the voltage output increase when a generator is made to spin faster? Defend your answer. -
## pure maths, agriculture,life sciences, physics

i want to know what does those subject i choose fall under which career -
## Physics

What will a spring scale read for the weight of a 75 kg woman in an elevator that moves upward with acceleration 0.30 g? w=? -
## Physics

With the energy needed to warm up some amount of water from 40C to 64C, how high could you lift it? -
## physics

A aluminum wire has a diameter and uniform electric field of imposed along its entire length -
## Physics

How much energy must be removed from 30 L of liquid water at 0-degree celsius in order to convert it to ice? -
## Physics

A baseball is thrown horizontally from a height of 3.6 meters at a speed of 24 m/sec. How far will it travel along the ground? -
## physics

calculate the energy evolved when 8 droplets of water of radius 1/2mm each combine into one. where s=0.072N/m. -
## physics

calculate the energy evolved when 8 droplets of water of radius 1/2mm each combine into one. where S=0.072N/m -
## Physics

Find the orbital velocity of a satellite orbiting 1800km above sea level in meters per second? -
## Physics

Find the electric potential at the centre of the square of side 1m at the four corners of charges of q1, q2,q3,and q4 are placed having values 3×10^-8C,-3×10^-8C,-5×10^-8C and 6×10^-8C respectively. -
## physics

Explain how an object can orbit a planet & why astronauts float around in the orbiting space shuttle -
## Physics

Two spherical objects with a mass of 7.60 kg each are placed at a distance of 2.93 m apart. How many electrons need to leave each object so that the net force between them becomes zero? -
## physics

a metal spoon is placed in one of two indentical cups of hot coffee. Which cup will be cooler after a few minutes? -
## Physics

How much potential energy does Tim, with mass 60.0 kg, gain when he climbs a gymnasium rope a distance of 3.5m? -
## physics

what is the net force on a car cruising at a constant velocity on (a) a level ground and (b) going up a hill -
## Physics

Calculate the distance (in km)that Larry runs if he maintains an average speed of 8km/hr for 45 minutes. -
## Physics

Why is the total distance traveled by a mass traveling in a circle of radius R during n revolutions, 2piRn? -
## physics

Find the rms speed of H2O molecules in atmospheric water vapor at a temperature of 13.2° C. -
## Physics

To what potential a sphere of radius 10cm be charged so that the surface density of charge is equal to 1 -
## physics

a pendulum clockis lag by 2 min during a whole 24 hours.what correction should be made in its length so that it keep the right time? -
## physics

a guy throws a ball up and catches it 3.5 seconds later. what is the max height and initial velocity. Please help! -
## Physics

2point charges of 1mc & 4mcr places 0.15m apart find the null point between them..? -
## Physics

What is the minimum energy needed to change the speed of a 1600 kg sport utility vehicle from 15.0 m/s to 40.0 m/s? -
## Physics

At highway speeds, a particular automobile is capable of an acceleration of about 1.52 m/s2. At this rate, how long does it take to accelerate from 74.0 km/h to 104.0 km/h? (in s) -
## physics

A 30.0 kg block falls from a height of 30,4 m. assuming a closed system its speed just before hitting the ground is about? -
## Physics

A car travels in a straight line for 4.8 h at a constant speed of 63 km/h . What is its acceleration? Answer in units of m/s 2 -
## Physics

A 100-n boulder is sitting on a shelf 0.5 meters above the floor. What is the potential energy when its in its new location? -
## Physics

What is the gravitational force between two 10 kg iron balls separated by a distance of 0.1 m? How does this compare with the weight of one ball? -
## Physics

Two spherical objects with a mass of 2.88 kg each are placed at a distance of 2.12 m apart. How many electrons need to leave each object so that the net force between them becomes zero? -
## Physics

a bb gun has a muzzle velocity of 325 ft/sec. How long will it take the bb to hit the ground? How far will the bb travel?