# physics please HELP !

74,851 results, page 54-
## Physics

A car travelled at an average speed of 200km/h. What distance does it cover in 10minutes. -
## Physics

how long does it take a car to change its velocity from 15m/s to 25m/s if it accelerates uniformly at 5m/s2. -
## Physics

If you wish to warm 100 kg of water by 20° C for your bath, show that 8370 kJ of heat is required.? -
## physics

Why is there always a difference between the experimentally calcuated error for resistance, and the actual components tolerance value? -
## physics

calculate angular momentum and rotational kinetic energy of earth about its own axis -
## physics

i want to know the force of 3.0 kg weight dropped from 1.0 meter height for breakage testing purpose -
## physics 8th grade

If a woman hasa mass of 50 kg calculate her weight in neutons -
## Physics

coin and a piece of glass are both heated to 60 degrees celsius which will be warmer when you touch it ? -
## physics

What are the principles behind seatbelts and air bags that make passengers safer in a collision? -
## physics

a ball is thrown vertically upward at a speed of 45 m/s. how long does it take to return to the ground? -
## physics

Can you find the pressure exerted on the floor by the heel if it has an are of 1.50 cm^2 and the woman's mass is 55kg? -
## physics-lenses

trace and describe the image formed by a convex lens (object between 2f and f) -
## Physics

A person stands 2.0 m away from the reflecting surface of a plane mirror. What are the image characteristics? -
## Physics

Two electrons exert a force of repulsion of 0.96 N on each other. How far apart are they? The elemental charge is 1.602 × 10 −19 C . -
## Physics

Why are the armature and field windings of an electric motor usually wound on an iron core? -
## Physics

how high does a stone rise if it is initially thrown at a rate of 15m/sec -
## Physics

If a light bulb draws 60 watts and I leave it on for 5 hours, how much energy has been consumed? -
## Physics

When calculating delta Tsample,why is th initial temperature taken to be 100 degrees Celsius -
## Physics - projectile

a ball is thrown straight up at 50 m/s. What speed will it be when it returns to the thrower's hand? -
## Physics

2.An airplane flies north at a constant speed of 220 km/h. How far will the plane travel in 3.50 h? -
## physics

what is the greatest acceleration can be generated by a runner if coefficient of friction between shoes and road is 0.95 -
## physics

a beam of electron 13.0 ev is used to bombard gaseous hydrogen. what series of wavelengths will be emitted? -
## physics

What is the wavelength of the peak of the blackbody radiation curve for the human body (T = 310 K)? -
## physics

A ball is thrown vertically upward at 14.7 m/s. Show that its maximum height will be 11m. -
## physics

a 0.03 mol sample of helium is taken through a cycle. the temperature of state A is 400K. calculate V. -
## physics

Whn sand is poured on a rotatory disc what happens to its angular velocity. Explain -
## physics

how do we calculate the height of a falling ball with a mass of 0.5kg and a velocity of 10m/s. -
## physics

calculate the speed of an 7.3*10^4kg airliner with a kinetic energy of 1.4*10^9J. answer in units of m/s. -
## Physics

Things around you are emitting infrared radiation that includes the wavelength 1.13 10-5 m. What is the energy of the photons? -
## PHYSICS

a 1500kg sports car accelerates from 0 to 30 m/s in 8 seconds. Whaat is the power of its engine? Please help -
## physics

How close must two electrons be if the electric force between them is equal to the weight of either at the earth's surface? -
## Physics

A rubber ball of mass 0.12kg is held at a height of 2.5m above the ground, and then released. -
## physics

Yeah I know it is! But it's really confusing me and it's what my teacher wants. Say I was to pick a height of 25m and a Velocity of 20.0m/s, what would be my next step? -
## physics

what is the height of the ball if the bottom of the swing is zero, speed is 2.8m/sec, 9.81 acceleration of gravity -
## physics

Uranium 235 has 92 protons in its atoms. Calculate the number of neutrons in this atom -
## Physics

A 200N sign hangs and makes a 15.5 angle with the horizontal. What is the Tension in each rope? -
## physics

How much work isneeded to stop a 20g bullet moving with a speed of 150m/s -
## Physics

What observation shows that diamond has a slightly different index of refraction for each of the various colours of the spectrum? -
## physics

An electron with initial speed = 2.54×10^7 m/s is traveling parallel to an electric field of magnitude = 1.66×10^4 N/C . -
## physics

What is the charge of a bare Magnesium nucleus (no electrons, just the protons and neutrons) in Coulombs? -
## Physics 1

What torque is needed to accelerate a 70Kg disk with a 20 cm radius from rest to 10 rad/s? -
## Physics

Is there any point along the path of a projectile where its velocity and acceleration vectors are: a) perpendicular to each other? b) parallel to each other? -
## Physics

For the problem (8.99 X 10^9 NM^2/c^2)(1 X 10^-6c) / (.1m)^2 = .90 N When I put this in my calculator I did not get .90N. Am I suppose to convert the units to get the answer. Thank you for your help. -
## physics

Things around you are emitting infrared radiation that includes the wavelength 1.44 10-5 m. What is the energy of the photons? -
## physics

Find the time constant (T) for the RC circuit with an open switch given t = 10 ms 50% of Qmax charge T = ? Q = CV (1-e -t/T) -
## Physics

a projectile is launched with an initial velocity of 60 m/s at an angle of 30 degrees above the horizontal. how far does it travel? -
## Physics

Find the uniform acceleration that causes's a car's velocity to change from 39.7 m/s to 74.0 m/s in an 5 second period of time. -
## Physics

Find speed of sound in air if distance is 170 meters and time is 1.1 second -
## physics

How much work is required to lift a 280 kg refrigerator to the second-story level that is 6m high? -
## Physics

Determine the displacement of a plane that experiences uniform acceleration from 77 m/s to 110 m/s in 16 seconds. -
## science/physics

What acceleration will you give to a 25.8 kg box if you push it horizontally with a net force of 89.6 N? -
## physics

Explain the changes in frequency with respect to changes in mass, length tension on sonometer bridge. -
## Physics

A car going 50 m/s undergoes an acceleration of 2 m/s^2 for 6 seconds what is the final velocity ? How far did it travel while it was accelerating? -
## physics

If you push a box for a distance of one meter with a force of 4,187 newtons How many calories have you used? -
## Physics

What would the percent error of the experimental value of g be if the accepted value is 9.8 m/s^2? The slope equation is y=.5001430132x-.0109639087 -
## physics

If a car accelerates from rest at a constant 5.5m/s^2, how long will be required to reach 28m/s? -
## physics

an iron bar measures 11 cm x 7 cm x 5 cm it is melted down to make a cylinder height of 9 cm what is its radius -
## Physics

What is the kinetic energy of a 1100 kg sports car traveling down the road with a speed of 22 m/s? -
## Physics 11

A girl stands 2.5 m infront of a plane mirror. If she sees someone else 2.0 m behind her, how far is she from the image of that person? -
## Physics

A nurse counts 76 heartbeats in one minute. What are the period and frequency of the heart's oscillations? -
## physics

The mass of an iron cube having an edge length 1.8 cm is 70 g. Find itd density. -
## physics

5. An object that has kinetic energy must have ____________________. A) momentum. B) acceleration. C) a force applied to it. D) All of these. E) None of these. -
## physics

Is there a way to calculate the moment of inertia of a hanging mass (3.1 kg) without length & width dimensions? -
## physics

Your friend says his remote control car travels at a velocity of 1.5 m/s. What is wrong with that statement -
## physics

What is the rotational speed of the minute hand on a clock? Convert from rad/s to rev/s -
## applied physics

if a DC motor uses a775 coulombs of charge in 15 seconds,how much current is produced -
## Active physics

How much hear must be added to 1.5kg of water at -25degC to raise it up to 119degC? -
## Physics

coin and a piece of glass are both heated to 60 degrees celsius which will be warmer when you touch it ? -
## physics

A force of 2 kg weight acts on a body of mass 4.9 kg .Find the acceleration produced. -
## physics

A 1.25-kg book in space has a weight of 8.35 N. What is the value of the gravitational field at that location? GIVEN: m = 1.25 kg W = 8.35 N Therefore, they want the acceleration. Would I use this equation g = Fg/m? -
## physics

A force of 2 kg weight acts on a body of mass 4.9 kg .Find the acceleration produced. -
## Physics

what is the average force needed to stop a car traveling 28m/s in 55m? -
## Physics

8. Fire engines used to be red. Yellow-green is now the preferred color. Why the change? -
## Physics

what is the average force needed to stop a car traveling 28m/s in 55m? -
## physics

What is the potential energy of a bear with the mass of 200 kg in 20 meter altitude of a mountain? -
## Physics

A 68.5kg man is standing still on an elevator that isn't moving, what is the normal force on him? -
## PHYSICS

a 1500kg sports car accelerates from 0 to 30 m/s in 8 seconds. Whaat is the power of its engine? -
## Physics

If an object has a work of 300J and a displacement of 20m, how would I determine the net force? -
## Physics

How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.8 µC? -
## physics-

In a string and pulley problem, will friction increase or decrease the tension.can you please explain if you can? -
## Physics

what is the distance that a satellite must be from Earths surface if it's period of rotation is 1 day? I really not sure where to even start.. -
## PHYSICS

At what height above Earth's surface is the gravitational acceleration reduced from its sea-level value by 0.40%? -
## physics

Find the mass of 0°C ice that 10g of 100 °C steam will completely melt -
## physics

c) A penny sits 12 cm from the center of a record turning at 33 1/3 rpm. What is the tangential speed in m/s? -
## Physics

What happens to your tongue when you lick an aluminum ice cream scrapper just after it has been used? Does it stick to the scraper? Why? -
## Physics

Make an analogy between heat capacity and density. Describe which quantities correspond to one another. Thanks! -
## Physics

As one exhales, what change in energy takes place between the diaphragm and the air in the lungs? -
## physics

a baseboard heater draws a current of 10.0A. How much charge passes through it in a time of 30 min? -
## Integrated Physics and Chemistry

The ____ motion of a star can be determined by studying its spectrum -
## Physics

A steel guitar string is 73 cm long and 0.15 mm in diameter. If it's under tension of 1.5kN, how much is it stretched? -
## Physics 1100

Find theta; and W in the figure below where w1 = 21.0 N, w2 = 34.0 N, and α = 64.0°, assuming that the arrangement is at rest. -
## physics

what has no beginning and no end. it is also considered as the medium for light in einstein's theory of relativity -
## physics

What are the factors that affect the quantity of heat needed to raise the temperature of a substance? -
## physics

Calculate the speed of a ball tied to a string of length 1.5 m making 4.6 revolutions every second. -
## Physics

How much work must be done to bring three electrons from a great distance apart to 1.0 * 10^(-10)m from one another (at the corners of an equilateral triangle)? -
## Physics

Find the mass of an object with the acceleration 15m/s^2 when an unbalanced force of 90.0N acts on it -
## Physics

Which color light is the result of a greater energy transition, red or blue? -
## Physics

An object accelerates uniformly from rest and covers 8m in 2 seconds. What is the distance covered in the third second? -
## physics

A 6.2kg piece of metal displaces 0.80 L of water when submerged.Find its density. -
## Physics

In ten to fifteen pages, write the applications and effects of solid expansion