# Physics!

73,661 results, page 58

### Physics help please

Calculate the allowed wavelengths for the emission of a photon initially in the n=3 state in a hydrogen atom

### Physics, Help!! URGENT!!!

A sprinter must average 24.0 mi/h to win a 100-m dash in 9.30 s. What is his wavelength at this speed if his mass is 84.5 kg?

### physics

A meteoroid is speeding through the atmosphere, traveling east at 15.5 km/s while descending at a rate of 10.6 km/s. What is its speed, in km/s?

### physics

An 80 kg skateboarder going 10 m / s is launched nearly vertically off a ramp as shown. Approximately how high does he go?

### physics

a fire hose held near the ground shoots water at a speed of 6.4m/s, at what angle should

### 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

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

### physics

A crate is given an initial speed of 5.0m/s up the 22.5∘ plane shown in (Figure 1) . Assume μk = 0.12.

### Physics

You swing a 2.40kg stone in a circle, using the full length of a thin 60.0cm rope.

### Physics

Determine Centripetal Acceleration acting on the person standing at the equator? (the radius of earth is given)

### physics

How fast will a roller coaster, with a mass of 1200 kg, be moving at the bottom of an 18 meter tall hill?

### Physics

Explain how you would determine how much error there is between a vector addition and the real results.

### 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

Find the radius of a spherical asteroid that has a density of 4600 kg/m3 and an acceleration due to gravity of 0.11 m/s2 at the surface. km

### physics

How much heat (in kJ) will it take to bring 56 kg of ice at -8°C to dry steam? Answer to 3 significant figures

### ap physics

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

### physics

Fall time under g is sqrt 2h/g. Can someone give a derivation from the equations of motion please? Thanks.

### So what about this one bob? Physics

Which of the following is closer to a guess? hypothesis<<<<< law question theory

### physics

A ball strikes against the floor and returns with double velocity.In which type of collision is it possible?

### Physics

How much force is required to accelerate a 1500kg car to a speed of 17m/s in a distance of 45m? Thank you.

### physics

a horse pull a barge with a force at an angle of 30¡ã to the horizontal for a distance of 20km . find the work done.

### physics

An ambulance is going away from me @ 40mph with a siren @ 1000Hz.Will I heat a higher or lower frequency

### physics please help

the potential difference across a load is 9V. explain what this means in more fundamental terms.

### Physics

A 50 cm diameter wheel rotates through 25 radians. How do I figure out the amount of distance it will move?

### physics

Can the gravitational potential energy of a baseball ever be negative? Yes No Explain without using a formula.

### Physics

A weight suspended from a spring is seen to bob up and down over a distance of 11 cm twice each second.

### physics

An object falls a distance h from rest. If it travels 0.45h in the last 1.00 s, find the time and the height of its fall.

### physics

would someone in a lift feel lighter or heavier as it accelerated upwards? explain your answer.

### 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

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

### 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

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

### 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

Leroy, who has a mass of 72 kg, is skateboarding at 5.9 m/s when he smacks into a brick wall and comes to a dead stop in 0.2 s.

### 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

how much work is done by the upward force of your head on a 50 N rock that you carry horizontally across a 10 m room?

### physics

A construction crane's cable lifts a 49.5-kg box upward with an acceleration of 1.30 m/s2. Find the tension in the rope. N

### Physics

A volleyball is served at an angle of 35 degrees with an initial speed of 5 m/s. What is the maximum height reached by the ball?

### Physics

A football is kicked at an angle of 40 degrees with an initial speed of 7 m/s. What is the horizontal distance traveled by the ball?

### physics

What design aspects of the snowmobile make it particulary useful for travel over ice and snow?

### physics

a force of 10N acts on an object and raises its speed from 0 to 5 m/s in 10s.calcuate the average power.

### physics

In a uniform magnetic field, can an Amperian loop ever have a non-zero value

### physics

A wheel has turned through 120 revs in 10 s after starting. find the angular acceleration.

### physics

A solid of relative density 1.25 is found to weigh 12g in water find its weight in air

### Physics

A dragster's top acceleration is 60m/s^2. If it accelerates for 3 seconds from the starting line, how fast will it be going?

### physics

a body projected with velocity 30m/s an angle 30¡ã with horizontal maximum height attained by he object is.........?

### physics

At 7.15 cents per kilowatt-hour, what does it cost to leave a 75.0W light burning 24.0 hours a day?

### physics

A 25HP electric motor turning a 1800 RPM will produce how many foot pounds of torque?

### Physics

1. A cannon ball M = 10.0kg with V = 2.4×102m/s is broken into 2 parts, if m1 = 6.4kg with angle 37° and m2 with 53°, what is the magnitude of v1 and v2?

### PHYSICS

Tin melts at 232 under standard atmospheric pressure. Express this temperature in kelvin

### physics

a cyclist moves around equilateral triangle6kn/h10km/h,12km/hfind average speed?

### PHYSICS

Determine the resulting temperature when 1kg of ice at 0 Degree celcius is mixed with 9kg of water.

### physics

A boy drops a mango from a tree it falls without rebound wat happens to its momentum

### Physics

An arrow is shot horizontally with a speed of 20 m/s from the top of a tower 60 m high .The time to reach the ground will be???????

### Physics

Steam of mass 11.0 g at 100°C is added to 126.7 g of ice at 0.00°C. Find the final temperature of the system.

### physics

Mechanical energy is the difference between the kinetic and potential energies of an object. true or false?

### physics

a person covers a distance of 31 km and displacement 3 kms and time 25.5 min calcuclate average velocity

### Physics

What is the tension in a 1-meter string that is spinning a 0.5-kg rock in a horizontal circle 3 times per second?

### physics

You have a mass of 60 kg and run up some stairs that are 5 m high in 6 seconds. How much power did you produce?

### PHYSICS

'show that a 2.5m length of wire with cross section area 0f 1.0mm and resistance of 0.75ohms has a resistivity o f 3.0 ×10-7'

### Physics

If a man weighs 900 N on the earth, what would he weigh on jupiter, where acceleration due to gravity is 25.9 m/s^2?

### physics

damon,reiny,steve,ms sue.plz get a solution 2 my question please itz urgent!!!

### physics

light from the sun travels 1.5x10km to reach the earth .how long does it journey take in minutes?

### physics

A bicycl rider starts from rest and moves with uniform acceration of 1.5m\s^2 it is velocity reachs 7.5m\s of a distance .......

### physics

A 2000-kg car starts from rest and gains a velocity of 20 m/s in 5 /0s. What force was applied on it? What formula/s will I use?!

### Physics

From what height must water fall from a dam to strike the margine waves w/ a speed 30m/s.

### PHYSICS

what is the central acceleration of an automobile driving at 40 kph on a circular tracks having radius of 30m?

### PHYSICS

Calculate the centripetal force on a 2100 kg carrounding a curve of 175 m radius at a speed of 60 kph.

### physics

Results for: In An Ideal Transformer, The Voltage And Current Are 220V,2A And Those In Secondry Are 2000V, IA. The Value Of I Is?

### physics

How much heat is needed to convert 1.0kg ice at -5celsius to steam at 105 celsius?

### physics-heat transfer-urgent pls

Calculate the energy absorbed when 8.5g of ice is melted at 0 Celsius. thank you

### Physics

What are three different kinds of automatic switching devices? What are the conditions that cause the on/off action of the switch?

### PHYSICS

compute for the density of a brake fluid used in a car which has a volume of 600cm^3 and a mass of 100 g?

### physics

Suppose the horizontal sweep of an oscilloscope takes 80ms how many cycles of a 100 Hz wave will be shown?

### Physics

A race car moving at 35 m/s is uniformly slowed to a stop in 50 s. Find 1) acceleration, and 2) stopping distance.

### PHYSICS

What is the force of attraction between two masses 5kg and 8kg at a distance of 60cm apart.

### physics

Power applied to a particle varies with time as P=(3t^2-2t+1)W. Find the change in kinetic energy between t=1s and 4s.

### Physics

An object initially at rest experiences an acceleration of 9.8 m/s^2. How much time will it take to achieve a velocity of 58 m/s?

### physics

a body travels from rest with acceleration 8ms find its velocity when it has covered a distance of 100m

### AP Physics

What is the minimum work needed to push a 1025 kg car 290 m up a 17.5° incline with zero friction?

### Physics

mike is skiing downhill at a 25 degree angle. if his weight is 350N assuming there is no friction what is his acceleration

### PHYSICS

TWO FORCES F1 AND F2 ARE ACTING AT RIGHT ANGLE TO EACH OTHER FIND THE EXPRESSION FOR THE RESULTANT FORCE?

### physics

a 4200 kg helicopter accelerate upward 3m/s^2. lift force is exerted by the air on the propellers?(g=10m/s^2)

### Physics

How fast must a plane fly at a latitude of 41.9° so that the sun stands still relative to the passengers?

### 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

What would be the average velocity of an object falling 1.25m from the rest, just as it strikes the ground?

### physics

an object takes 0.35 seconds to hit the floor, what height did it fall from? is the way to calculate it h = gt^2 / 2 so would it be = h = .5 * 9.8 * 0.35^2

### Physics

Wat direction will the Electric Field Lines be in a parallel plate capacitor containing a dielectric ?

### physics

2)if a curved of radius 50m is banked at 30 degree will a car travelling at 60 km/hr along the curve will safe?

### 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

Calculate the speed with which a swimmer enters water if she slides down a frictionless ramp that is 2.6 m high

### Physics

How long it takes a car at 20m/s to come to a stop without friction, obstacles, or breaks ?

### Physics

Find the range at an arrow that leaves a bow at 45 m/s at an angle of 50 degrees above the horizontal level.

### Physics

What is the magnitude of the momentum of the 0.057-kg tennis ball when it travels at a speed of 29 m/s? Earth is the frame of reference.

### physics

calculate the maximum working current of an appliance rated at 2.4kw with an operating voltage of 240v

### physics

calculate the maximum working current of an appliance rated at 2.4kw with an operating voltage of 240v

### Physics

A ball is thrown vertically upward with a velocity of 30m/s. Determine the maximum height reached

### Physics

What is the total time of flight of an object projected vertically upwards with a speed of 30m/s? (g=10m/s^2

### physics

When the ray of light travels from air to glass slab and strikes the surface of separation at 90 degree , then it ..........

### Physics HW Plz help

Why can't most objects like an apple travel at speeds above the speed of light?