# Physics!

73,661 results, page 91

### physics

It takes 5.50 J of work to stretch a spring 5.90 cm from its unstressed length. What is the spring constant k in N/m?

### physics

It takes 9.10 J of work to stretch a spring 5.10 cm from its unstressed length. What is the spring constant k in N/m?

### physics

The speed of sound in air at 20 degrees C is 343m/s. This corresponds to a speed of ____mi/hr.

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What happens to the size of a hole in a metal plate when the plate is heated / cooled

### physics

What happens to the size of a hole in a metal plate when the plate is heated / cooled

### PHYSICS PLEASE HELP !!!!!

If a mass lies on an incline, what is the reaction force to the weight of the mass?

### Physics

A boy has a mass of 45 kg and is running with a velocity of 8 m/s. Find the boy's kinetic energy.

### physics

Brad tosses a rock straight up at 38.4 m/s. What is the rock's velocity after 2.0 seconds?

### physics

An object is located 87.6 cm from a concave mirror that has a focal length of 17.0 cm. Where is the image located?

### Physics

the coefficient of friction between a 78 kg box and a warehouse floor is .21. what is the friction force?

### Physics

What is the fundamental frequency for a 62 cm banjo string if the speed of waves on the string is 470 m/s?

### physics

a force of 20 n is applied to a 10 kg mass on a level frictionless surface what is the acceleration of the mass?

### Physics

Suppose A=3i-2j+k, B=-i-4j+3k&C is a vector lying along x-axis with the property that A.(B+C)=0. Then find vector C.

### Physics

A rocket expels gases at a rate of 1.30 x 10^3 kg/s with a speed of 3.00 x 10^4 m/s. What is the force exerted on the rocket?

### physics

A constant friction force of 15 N acts on a 70 kg skier for 20 s. What is the skier's change in velocity?

### physics

Which of these two is faster-a plane traveling at 250km/hr and a cat running at 250km/hr

### physics

a comet experiences a uniforn acceleration from 60m/s to 183m/s what is the rate of acceleration?

### physics

Mr.FIsher can kick a 2 kg football upwards at 20m/s, how high does the football travel?

### physics

A capacitor that is connected to a 70.0 V source contains 105.0 µC of charge. What is the capacitor's capacitance?

### Physics

How much energy is need to raise 50 kg of warm water from 45 celcius to 80 celcius?

### Physics

Charges of -10.8 nC and -24.2 nC are separated by 0.813 m. What is the potential midway between the two charges?

### Physics

A parallel plate capacitor has a capacitance of 1.71 nF. There is a charge of 0.809 μC on each plate.

### Physics

What is the acceleration of an 0.4m aluminum cube with a density of 2.72 in a beaker of methanol, which has a density of .791?

### physics

e relative to the ground. The airplane’s speed relative to the air is 77.9 km/h. Answer in units of km/h

### physics

The car has a mass of 1200kg Calculate the kinetic of the car when it travels at a speed of 12 m/s.

### Physics

A 0.168kg hockey puck slides at 11.4m/s. what is the work needed to stop the puck?

### Physics - grade 11

The speed of light of a plastic is 1.4x10^8. What is the index of refraction in the plastic?

### physics

You walk 50 m to the north, then turn 60° to your right and walk another 45 m. How far are you from where you originally started?

### physics

You walk 50 m to the north, then turn 60° to your right and walk another 45 m. How far are you from where you originally started?

### PHYSICS HELP!!!!!!!

You walk 50 m to the north, then turn 60° to your right and walk another 45 m. How far are you from where you originally started?

### physics

Suppose the water waves have a velocity of 1.2m/s and wavelength of 2.4m What is the frequency of the waves?

### physics

An electromagnetic wave in a vacuum has a magnetic field with a magnitude of 1.7 x 10^-6 T. What is the intensity S of the wave?

### physics

If you shout across a canyon and hear the echo 0.42 s later, how wide is the canyon?

### Physics

If the two input voltages to a 2-input summing amplifier are +2 V and +5 V, what is the output voltage?

### Physics

If the critical frequency of a low-pass filter is 5 kHz, what is the filter bandwidth?

### Physics

If you can see the face of a friend who is underwater, can she also see you? Please explain. Thanks :)

### physics

If the critical angle of a liquid is 41.4 degrees find the index of refraction for that liquid

### physics

if a person is pushing a cart with a force of 40 Newtons and it accelerates at 0.5 m/s2 , what is the mass of the cart ?

### physics

When an electron jumps from the 4th orbit to the 2nd orbit which series line does it get?

### Physics

A car is initially traveling at 20 m/s when it accelerates to 35 m/s in a time of 5 seconds. What is the acceleration of the car in m/s^2?

### Physics

What is the fundamental frequency for a 58 cm banjo string if the speed of waves on the string is 450 m/s?

### Physics

A spring vibrates at 8Hz,when a mass of 0.82kg is hung from it.What is the spring constant?

### physics

What is the fundamental frequency for a 60 cm banjo string if the speed of waves on the string is 480 m/s?

### Physics

At a certain distance from the center of the Earth, a 4.00-kg object has a weight of 1.95 N. Calculate this distance.

### physics 1

a car is being pulled out of the mud by two two ropes

### PHYSICS

SILICON DENSITY 1.05G/CM3 1MTR x 1MTR x4MM HEIGHT

### physics

How much work can a 22 kW car engine do in 60 seconds if It is 30% efficient It is 100% efficient

### physics

An 21.0 , 12.0 , and 5.0 resistor are connected in series with an emf source. The current in the 12.0 resistor is measured to be 4.00 A.

### physics

A plane traveling at 260m/s has a speed of Match 0.80. What is the speed of sound in the air

### physics

Give an example of an object that moves in a direction opposite the direction of its acceleration

### Physics

Give an example of an object that moves with constant acceleration and constant speed.

### physics

A lead ball has a volume of 94.3 cm3 at 19.3°C. What is the change in volume when its temperature changes to 34.3°C?

### Physics

A lead ball has a volume of 94.3 cm3 at 19.3°C. What is the change in volume when its temperature changes to 34.3°C?

### Physics Diploma Q?

a photon drops from -22 eV to a ground state of -89.2 eV. the frequency the photon emits is? [1.62]

### Physics

which do you prefer to use, an instrument which is more precise or one which is more accurate? WHY? thanks po! :)

### physics

Find the tension T2 of the box hanging from the rope if 1 = 25°, 2 = 65°, T1 = 60.58 newtons, and W = 143.4 newtons

### Physics

vertically up at 28m/sec, gravity 9.8 meters/sec^2 = what is max. height

### Physics

Add (9.3x10^3) + (9.3x10^4) + (0.011x10^6) using correct significant figures?

### Physics

An arrow is shot horizontally from a cliff at 15 m/s land 30 m away. How high is the cliff?

### Physics

An arrow is shot horizontally from a cliff at 15 m/s land 30 m away. How high is the cliff?

### physics

If an 8N force is applied to a wall for 2 minutes and the wall does not move, how much work is done?

### physics

list the contact and non contact forces in mathematics. What is the cold welding?

### physics

from equation t equal to root x+3 find velocity and acceleration t equal to 1second

### physics

from equation t equal to root x+3 find velocity and acceleration t equal to 1second

### physics

Why should we add a the value 273 to change a celcius value in to kelvin.?

### physics

A ball is dropped from a height of 18.6 m. What is the velocity of the ball the instant it hits the ground?

### physics

How do I find the acceleration on a velocity time graph when the graph has an irregular shape.

### physics

A football is kicked 66.6 meters. If the ball is in the air 5.39 s, with what initial velocity was it kicked?

### Physics

How many calories will take to convert 5 grams of 90C degree water to 0 C degree?

### physics

If Joe weighs 100N on the moon how much will Joe weigh on earth? N & kg

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What is the magnitude of displacement for a person that walks 6.0-km North-East, 4.0-km East, and 6.0-km South?

### physics

What is the magnitude of displacement for a person that walks 6.0-km North-East, 4.0-km East, and 6.0-km South?

### physics

A soccer ball kicked with a force of 14.8 N accelerates at 6 m/s2 to the right. What is the mass of the ball?

### physics

an object accelerates at 0.8m/s2 when a resultant force of 200n is acting on it what is the mass of the object

### physics

what is acceleration of an object over a 4second period if its starting velocity is 8 m/s and it velocity is 20 m/s?

### Physics

a spring with a spring constant k= 1340 N/m is oriented find the rate of compression

### physics

The pendulum on a cuckoo clock is 5.00 cm long. (a) Determine the period of this pendulum. (b) What is its frequency?

### Physics

What is the equivalent resistance of two resistors of 2 ohm and 3 ohm connected in parallel?

### physics

find the magnitude of vector by scalar and vector A= ? + 4j +4k B= ? + 2j + 3k if the angle between them 15 degrees.

### physics

The index of refraction of a certain type of glass is 1.58 what is the speed of light in the glass ?

### physics

It takes 2.5 J of energy to stretch a helical spring by 15 cm. Determine the spring constant.

### physics

Haloke does 179 J of work lifting himself 0.296 m. What is Haloke's mass?

### physics

A car is moving at 37 m/s. It slams on its brakes and comes to a stop in 22 m. What was the acceleration from the brakes?

### Physics

An arrow was shot vertically upward at a velocity of 50.0 m/s. What was its velocity after 2.00 seconds?

### Physics

What force is needed to give a 0.25-kg arrow an acceleration of 196 m/s2? A. 0.25 N B. 49 N C. 196 N D. 748 N

### Physics

A car traveling at 20 m/s accelerates at 7 m/s2 for 3 sec. How fast is it now traveling? Please help!

### physics

A wave travels 750 meters in 5 minutes. Its wavelength is 16.1 meters. What is its period?

### physics

An object has a charge of −2.4 ìC. How many electrons must be removed so that the charge becomes +2.8 ìC

### physics capacitor

What voltage is required to store 8.0 x 10-5 C of charge on the plates of a 6.1-μF capacitor?

### physics

The temperature of the air outside on a cool morning is 11„aC.What is this temperature on the Kelvin scale?

### physics

The temperature of the air outside on a cool morning is 11„aC.What is this temperature on the Kelvin scale?

### Physics

Calculate the pH of a solution obtained by mixing 100cm3 of 0.1M HCl and 100cm3 of 0.2M NaOH

### Physics

Calculate the pH of a solution obtained by mixing 100cm3 of 0.1M HCl and 100cm3 of 0.2M NaOH

### Physics

A cheetah can run with a speed of 29 m/s. Determine the distance travelled by a running cheetah in 8.6 s

### Physics

When a light passes from glass to air, which of the following is correct for the path of the light?

### physics

A basketball player can leap upward 0.69 m. What is his initial velocity at the start of the leap?

### Physics: Pressure Problem

What is the total pressure at the bottom of a lake at a depth of 38m?

### physics

Bob is driving 25 m/s and he turns a corner with a radius of 37 m. How much is Bob accelerating?

### Physics

A 1200.0-kg car speeds up from 16.0 m/s to 20.0 m/s. How much work was done on the car to increase its speed?