# physics please HELP !

74,755 results, page 57-
## Physics

A loud speaker emits energy in all directions at a rate of 2.75 J/s . What is the intensity level at a distance of 25 m? -
## physics

If a car is traveling westward with a constant velocity of 20 m/s, what is the net external force acting on it? -
## physics

calculate how far along the ground would the bicycle move if one of the wheels had an angular displacement magnitude of 500rev -
## Physics

A boy sledding down a hill accelerates at 1.70 m/s2. If he started from rest, in what distance would he reach a speed of 7.40 m/s? -
## physics

A motorcycle, initially traveling at a speed of 14 m/s, slows down (decelerates) at a rate of -3.5 m/s2 for 2 s. How far does it travel during that time? -
## physics

a student does 314 J of work in moving a desk 2.1 m. What was the magnitude of the applied horizontal force? -
## Physics

How much work is done by a girl weighing 450N while carrying a 2kg package up a 2m flight of stairs? -
## physics

What should be the minimum initial velocity with which a missile has to be launched so that it reaches a target of 1000km away in the same plane -
## college physics

an automobile traveling at 25.0 km/h along straight,level road accelerates to 65.0 km/h in 6.00s what is the acceleration -
## physics

A 7.9 kg object undergoes an acceleration of 2 m/s2. What is the magnitude of the resultant force acting on it? Answer in units of N. -
## Physics

If a man travels 7km N 40degree W and 10km East, find the resultant displacement. -
## science (physics)

thank you for your help! my question is :how do you find the magnitude of the electric field that will balance the weight of an electron? -
## Physics

Explain how a drop of water bulging over the edge of a coin demonstrates surface tension. -
## Physics

How can you easily increase the magnetic field strength inside a current carrying coil? -
## physics

how much heat must be added to 4.00 kg of aluminum to cause its temperature to rise from 22 degrees C? unit of answer must be joule -
## Physics

Is it possible for the frictional force to increase the mechanical energy of a system? If so, give 2 examples with brief explanations. If not, why not? -
## physics

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

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

Two objects attract each other gravitationally with a force of when they are 0.25 m apart. Their total mass is 4.00 kg. Find their individual masses -
## Physics

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

A flashlight that is powered by 12 Volts and uses a bulb with a resistance of 90 Omega will have a current _________________ Amps. -
## Physics

A boy sledding down a hill accelerates at 1.70 m/s2. If he started from rest, in what distance would he reach a speed of 7.40 m/s? -
## physics

A 1.5 volt battery will increase the potential energy of ________________ coulombs of charge by 0.18 joules. -
## physics

A passengers jet flies from one airport to another 1,200 miles away in 2.5h .Find its average speed. -
## physics

a 747 airliner reaches its takeoff speed of 170 in 35.0 .what is the magnitude of its average acceleration -
## Physics

Could someone tell me how to start to solve this? Please How much current flows in a 1000-ohm resistor when 1.5 volts are impressed across it? -
## physics

Calculate the speed of an 7.6×104 kg airliner with a kinetic energy of 1.2 × 109 J. Answer in units of m/s -
## Physics

What is the centripetal acceleration of an automobile driving at 40 km/h on a circular track of radius 20m? Help ASAP please!!! -
## physics

what is the formula to calculate the following: how much force is needed to move a 10 pound block 10 feet in 8 seconds> -
## physics

if the masses remain the same ,but the separation is decreased to one-half of the original distance . what happens to the gravitation force? -
## physics

How much work must an ideal refrigerator perform to make 1 kg of ice at -10C from 1 kg of water at 20C when 20C is also its exhaust temperature? -
## Physics

A football player kicks with a speed of 21 m/s at 37 degree to the horizontal. How long is the ball in the air? -
## physics: relativity

I think I can rearrange the Lorentz contraction equation, solving for v using: v=sqrt[1-(L/Lo)^2] x c^2 Would someone check my thinking please? Thanks -
## Physics

Two bullets have masses of 4.6 g and 11 g, respectively. Each is fired with a speed of 41.0 m/s. a) What is the kinetic energy of the first bullet? Answer in units of J. -
## physics

calculate the work done in lifting a 300N weight to a height of 10m with an acceleration 0.5 m/s square. -
## Physics

When an inflated baloon is been put in the freezer for 15 minutes, which of the ideal gas law is the observation -
## 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

r vector=(340m, 39 degrees below positive x-axis) What is rx and ry? I have no idea how to do or approach this problem, anyone please help and explain how to do this? Thank you! -
## physics

If a race car completes a 4mi oval track in 73.2s, what is the average speed in units of mi/h? -
## Physics-Please help

Could someone remind me how to calculate this on the TI-84 Calculator: Which buttons do I hit for this: 3 * 10^8/5.4 * 10^14 I'm inputting it and coming up with 5.55 E 21 It should come out to be 5.55 *10^-7 but I'm not doing the input correct Please help -
## science-physics

What is the formula to calculate the speed of the electron the has a mass of 0.910000000000000000000000000000 kg and a radius of 0.5290000000000 m? -
## physics

what is the acceleration due to gravity at a distance of 2 earth radii abouve earths surface? -
## 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

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

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

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

A football is kicked at 15 m/s with an angle of 35 degrees with the ground. How long is it in the air? How far will it land? Can someone help plz... Thanks! -
## physics

Two uniform spheres , each of mass M and radius R, touch one another. What is the magnitude of their gravitational force of attraction? -
## Physics

Explain atomic line spectra in terms of transitions between discrete energy levels. -
## physics

If a race car completes a 4mi oval track in 73.2s, what is the average speed in units of mi/h? -
## physics

If a race car completes a 4mi oval track in 73.2s, what is the average speed in units of mi/h? -
## physics

State the surface powers required to produce the following lenses with +6.25D front curves. a. -0.50 DS b. +0.50 DS c. +1.75 DS -
## Physics

the teacher said something about doing the correct sig figs..im not sure if it applies to this, im so confused! 10.2* 7.5 =76.5? 27.1/5.31 =5.103578154425612?? 2.712 + 10.8= 13.512? -
## physics

State the surface powers required to produce the following lenses with +6.25D front curves. a. -0.50 DS b. +0.50 DS c. +1.75 DS -
## physics

State the surface powers required to produce the following lenses with +6.25D front curves. a. -0.50 DS b. +0.50 DS c. +1.75 DS -
## Physics

A 4610 kg helicopter accelerated upwards at 2 m/s^2. What lift force is exerted by the air on the propellers? -
## Physics

A volleyball player serves the ball horizontally with a speed of 23.8 m/s. How far will it have dropped when it reaches a distance 9.1 m -
## physics

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

An elevator is moving upward at 1.03 m/s when it experiences an acceleration 0.31 m/s2 downward, over a distance of 0.73 m. What will its final velocity be? -
## physics

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

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

Displacement is to distance as velocity is to: a. acceleration b. mass. c. speed. d. time I chose C....is this correct? -
## Physics

What push parallel to a 42 incline is required to just start a 340 N block sliding up the plane? us = 0.6 -
## physics

A certain bacterium swims with a constant speed of 4.61 µm/s. How long will it take to swim across a petri dish that has a diameter of 8.69 cm? -
## PHYSICS

what is the angle velocity of an object in a horizontal circular part with radius 1.5 with a constant speed of 12/s -
## physics

two electric charges +10 microC and -20microC are located .35 m apart how much work is required to double the distance between them? -
## physics

two electric charges +10 microC and -20microC are located .35 m apart how much work is required to double the distance between them? -
## Physics

An airplane lands and starts down the runway at a southwest velocity of 43 m/s. What constant acceleration allows it to come to a stop in 1.1 km? -
## physics

a dragster starting from rest accer;ates at 49m/s how fast is it going when it has raveled 325m? -
## physics

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

A boy sledding down a hill accelerates at 1.65 m/s2. If he started from rest, in what distance would he reach a speed of 7.30 m/s? -
## physics

Calculate the watts of power expended when a force of 1.8 N moves a book 2.0 m in a time interval of 1.0 M/S -
## 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

An object is projected at an angle of elevation of 45 degree with a velocity of 100m/s. Calculate it's range -
## physics

What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 10.5 m/s when going down a slope for 3.18 s? -
## Physics

How much work must be done to bring three electrons from a great distance apart to within 2.1Ã—10âˆ’10 {\rm m} from one another (at the corners of an equilateral triangle)? -
## physics

How does one go about solving this? A skateboard rider starts from rest and accelerates at a constant +.50 m/s^2 for 8.4s. What is the riders displacement? -
## physics

What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 7.9 m/s when going down a slope for 7.4 s? -
## physics

if a race car's velocity increases from 4 m/s to 36 m/s over a 4 s time interval, its average acceleration would be 10 m/s 2 ? IS THIS TRUE ? -
## physics

Compute the electric field about a uniformly charged plane sheet using gauss law. -
## physics

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

arthur is riding a horse at a velocity of 4m/s.four seconds after,he is already traviling at a valocity of 12m/s. what is his acceleration? -
## physics

A uniformly accelerated particle covers three successive equal distances in time intervals t1, t2 and t3 respectively. -
## Physics

Janetjumpsoffahighdivingplatformwith ahorizontalvelocityof2.96m/sandlandsin thewater2.8slater. Howhighistheplatform ?Theacceleration ofgravityis9.8m/s2. -
## physics

A uniformly accelerated particle covers three successive equal distances in time intervals t1, t2 and t3 respectively. -
## Physics

What is the mass of a paratrooper who experiences an air resistance of 400 N and an acceleration of 4.5 m/s2 during a parachute jump. -
## physics

A ball tossed upward reaches a maximum height of 3.0m. Show that its initial speed was 7.7m/s. -
## Physics

I don't understand any thing about the centripital force and torque please HELP me to solve problems about this topics. -
## Physics

If a tern travels 3.20 x 10^4 km south in 122 days, what is its average velocity in kilometers per day? -
## Physics

If a tern travels 3.20 x 10^4 km south in 122 days, what is its average velocity in kilometers per day? -
## physics

a baseball is thrown horizontally at a velocity of 35 m/s from a height of 1.5 m. How long does it take to hit the ground? how far does it travel? -
## physics

For an object in equilibrium the sum of the torques acting on it vanishes only if each torque is calculated based on your: -
## physics

If the building absorbed so much heat that it turned into a liquid, then it would have undergone a phase change known as _________. -
## Physics

A car travels in a straight line for 5.4 h at a constant speed of 79 km/h . What is its acceleration? Answer in units of m/s2. -
## PHYSICS ASAP!

A Football is kicked 66.6 meters in 5.39 seconds. What was the initial velocity? Magnitude and Direction -
## Physics

How many calories of heat will a person lose by evaporating 1250g of water and perspiration in a day? -
## physics

in einstein's famous equation e=mc^2, describing the relationship between matter and energy, the units for E are m=====>kg, c=====>m/s a) kg m/s b)kg m/s^2 c) m^2/s^2 d)kg m^2/s^2 I think its either B or D but indecisive...