# Math/Physics

209,467 results, page 85

### physics

Leroy, who has a mass of 90 , is skateboarding at 8.6 when he smacks into a brick wall and comes to a dead stop in 0.2 .find the force of impact

### physics

how can we collect sound energy from outside? then it can be converted into electricity with the help of transducer. Have to prepare a model on this. Please earlier.

### physics 101

50kg drops from a height of 2meters straight down with a force constant of 8 x 1000n/m. What maximum distance does she compress?

### Physics

How does the cochlea sense sound? •Snail shaped tube lined with receptor cells which transmits signals to the brain. Correct?

### Physics

A skier is gliding along at 5.0{\rm m/s} on horizontal, frictionless snow. He suddenly starts down a 15{\rm ^{\circ}} incline. His speed at the bottom is 15{\rm m/s} .

### physics

If a seagull flies to a height of 22.5 meters, how long will the clam take to fall? The acceleration of gravity is 9.8m/s. answer in units of sec

### physics

Calculate the magnitude of the electrostatic force the two down quarks inside a neutron exert on each other if they are separated by a distance of 0.71 fm.

### physics

explain the scientific method for dropping a penny from the empire state building to see if it will penetrate someones head below

### physics

A 67.5 kg hoop rolls along a horizontal floor so that its center of mass has a speed of 0.090 m/s. How much work must be done to stop it?

### Physics

a major league outfielder throws a baseball horizontally with a velocity of 22 m/s, released from a height of 1.8m. how far does it go before it hits the ground ?

### 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

A 50 kg diver leaps off the 20 meter diving board with a velocity of 5 m/s. What is his kinetic energy just before hitting the water?

### Physics

A satellite is to be put into a circular low earth orbit at 149 km above surface. What orbital speed (km/s) is required?

### physics

(a) ____Fe(s) + ____S(s)h____Fe2S3(s) (b) ____P4 (s) + ____H2(g)h____PH3(g) (c) ____NO(g) + ____Cl2(g)h____NOCl(g) (d) ____SiCl4(l ) + ____Mg(s)h____Si(s) + ____MgCl2(s)

### PHYSICS

COULD YOU FURTHER EXPLAIN HOW MANY BTU ARE REQUIRED TO RAISE THE TEMP OF500 GALLONS OF WATER FROM 70 DEGRESS TO 160 DEGREES FAHRENHIET

### Physics

How long would a braking torque of 3.17 N·m have to act to just stop a spinning wheel that has an initial angular momentum of 6.67 kg·m2/s?

### Physics

A 16 kg box slides across the floor with an initial velocity of +7.8 m/s. It comes to a stop after sliding +14.6 m. How much friction was present?

### Physics

Describe the waves reflected from an elliptical reflector when the incident wave comes from a point source at one focus of the ellipse?

### Physics- Help

Five forces act on an object. (1) 63 N at 90° (2) 40 N at 0° (3) 75 N at 270° (4) 40 N at 180° (5) 50 N at 60° What are the magnitude and direction of a sixth force that would produce equilibrium?

### Physics- Help

Five forces act on an object. (1) 63 N at 90° (2) 40 N at 0° (3) 75 N at 270° (4) 40 N at 180° (5) 50 N at 60° What are the magnitude and direction of a sixth force that would produce equilibrium?

### Physics- Help

Five forces act on an object. (1) 63 N at 90° (2) 40 N at 0° (3) 75 N at 270° (4) 40 N at 180° (5) 50 N at 60° What are the magnitude and direction of a sixth force that would produce equilibrium?

### physics

carbon dioxide forms into solid (dry ice)at approximately -150 F. What temperature in degree celsuis does this correspond to?

### physics

water is moving at a velocity of 2m/s through a hose with an internal diameter:1.60cm. What is the flow rate in liters per second?

### Physics

Five forces act on an object. (1) 63 N at 90° (2) 40 N at 0° (3) 83 N at 270° (4) 40 N at 180° (5) 50 N at 60° What are the magnitude and direction of a sixth force that would produce equilibrium?

### Physics

how fast would you have to be traveling at in a spaceship in order to appear to age 20% slower than your classmate left behind on earth

### Physics

Three resistors 2.5 Ù, 3.5 Ù and 4 Ù are connected in parallel. What is the equivalent resistance? I know you must use 1/Req = 1/R1 + 1/R2 + 1/R3 But then I get .935 and I don't think that's correct. What am I missing? Thanks

Two nitrogen atoms are separated by 4 cm. Each atom has 2 extra electrons. What is the force between them? is it attractive or repulsive? Explain.

### Physics

A stone popelled from a catalpult with the speed of 50m/s attained a height of 100m. Calculate the time of flight and angle of projection.

### physics

what frequency and period would be required for sally and her hard-working partner to produce a standing wave with three nodes?

### Physics

Calculate the magnitude of the drag force on a missile 63 cm in diameter cruising at 220 m/s at low altitude, where the density of air is 1.2 kg/m3. Assume C = 0.75.

### Physics

A satellites are placed in a circular orbit that is 1.62 × 108 m above the surface of the earth. What is the magnitude of the acceleration due to gravity at this distance?

### physics

How fast is a city on the earth's equator (such as Singapore) moving due to our planet's daily spin on its axis?

### Physics

in a wire AB of uniform cross section in which a potential gradient of 0.1 V/m exist.If the balancing point is foung to be 180 cm from A then what is the Emf of the cell?

### Physics

An electric filament can heat 200 cm3 of water from 5°C to 95°C in 6 minutes. If the voltage source is a 12 V battery, how much current does it draw?

### physics

A 71.1 kg man steps out a window and falls (from rest) 1.24 m to a sidewalk. What is his speed just before his feet strike the pavement?

### Physics

What is the total kinetic energy if a 0.30 kg block is sliding on a smooth horizontal surface at 2.5 m/s, heading towards a light spring that is in equilibrium?

### Physics

What is the total kinetic energy if a 0.30 kg block is sliding on a smooth horizontal surface at 2.5 m/s, heading towards a light spring that is in equilibrium?

### physics

if a cyclist takes one minute to comple half revolution on a circular path 120 m radius.what is the average velocity?

### physics

2 balss,one of iron and the other of aluminium,will experience the same upthrust, when dipped in water when both have equal what?

### Physics

How much work is done pushing a wheel barrow full of cement 5.3m forward if a force of 500N is applied 20 degrees from the vertical?

### Physics/Optics

What would the image size of the moon be if you photographed it at Cassegrain focus of a 24-inch telescope with a focal length of 9600mm?

### Physics

Moment of inertia of a 'non-uniform' ring of mass M and radius R about axis through centre and normal to its plane is

### physics

A group of hikers hears an echo 2.50 s after shouting. If the temperature is 20.0°C, how far away is the mountain that reflected the sound wave?

### Physics

An object of mass 20kg slides down an inclined plane at an angle of 30 degree to the horizontal. The coefficient of static friction is?

### physics

A production line inspector wants a mirror that produces an image that is upright with a magnification of 7.1 when it is located 10.0 mm from a machine part. What is its radius of curvature?

### PHYSICS

A SPRING WITH A CONSTANT K = 8N/m IS STRETCHED 5CM AND RELEASED. IT BOBS UP AND DOWN EVERY 2.5 SECONDS. WHAT IS ITS FREQUENCY, PERIOD, ABD AMPLITUDE

### physics

The distance between two planets is 1.6 x 10^6 m. How much time would the light signal take to go from one planet to the other?

### Physics

Temperature of a diatomic gas is 300k. If the moment of inertia of its molecules is 8.28*10^-38 gm-cm^2. Calculate their root mean square angular velocity.

### Physics to Elena

Ex=0 ; Ez=0 Ey = 10   sin(3.14x - 6.08e8 t) what is the time-averaged Poynting vector (magnitude and direction) for the position x=y=z=−3 ?

### PHYSICS/CHEMISTRY

Can someone explain to me, what does Metastable isotope means? I already read the definitions on the internet but I really don't understand it. Thanks in advance.

### physics

a 75-kilogram bicylcist coasts down a hill at a constant speed of 12 meters per second. what is the kinetic energyof the bicyclist?

### physics

How many calories of heat must be added to 455 g of steel to raise its temperature from 20 °C to 192 °C? (Note: csteel = 0.115 cal./g. °C.)

### physics

How far to the nearest tenth of a meter can a runner running at 5.33 m/s run in the time it takes a rock to fall from rest 67 meters?

### physics

A solid sphere of mass 2 kg is rolling without slipping on a table with linear speed of 0.5 m/s. Calculate its total kinetic energy.

### Physics

At what distance should an object be placed in front of a convex lens of focal length 20 cm to obtain an image of double its size

### science (physics)

a skaterboarder is moving 5.25 m/s when he starts to roll up a frictionless hill. how much higher is he when he comes to a stop? (energy problem)

### Physics

An arrow of mass 1000kg was fired from rest with a velocity of 15m/secs for a period of 0.5secs.calculate the applied force.

### physics

a monatomic gas initially at 19 degree celsius is suddenly compressed to 1/10th its original volume .what is temperature after compression?

### physics

two ropes are tied on a post and applied with forces of 8 and ion.If the amgle between them is 60degrees. Find the resultant vector

### Physics

A block weighing 6.2 N requires a force of 2.2 N to push it along at constant velocity. What is the cooefficient of friction for the surface? Plsssss help asap..

### physics

What mass would you hang on the right side of the system in the figure to balance it -- that is, to make the clockwise and counterclockwise torques equal? (Let x1 = 30 cm and x2 = 12 cm.)

### Physics

The flux through a window whose surface is parallel to magnetic field lines is zero. Answer True False

### Physics

A material that remains highly magnetized after a magnetization cycle has a large hysteresis area. Answer True False

### physics (fluids)

If a object of radius 3 cm is attached to the ground in a 3 m deep sea, what is the vertical force in N with which the water (density = 1000 kg/m^3) presses on it?

### physics

Using a small pendulum of length 0.171 m, a geophysicist observes that it completes 1 cycle every 0.833 s. What is the value of g at his location?

### physics

An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?

### physics

An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?

### physics

An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?

### physics 2

calculate the mass of air inside a 500 liter container at a pressure of 200 kpaa and temperature is 30 degree celsuis

### Physics

“Strontium-90 is a pure beta source.” How could a physicist test this statement? I am stuck on this one, but I was thinking through measurement of radioactivity.

### physics

A bullet was fired horizontally from the top of a 1.5x10^2 m tall tower at 2.8x10^2 m/s. Determine its speed on impact with the ground below.

### Physics

If Joe rides south on his bicycle in a straight line for 29 min with an average speed of 14.8 km/h, how far has he ridden? Answer in units of km

### Physics

A boy sledding down a hill accelerates at 1.24 m/s2 . If he started from rest, in what distance would he reach a speed of 8.88 m/s? Answer in units of m

### Physics

An elevator is moving upward 1.17 m/s when it experiences an acceleration of 0.33 m/s2 downward, over a distance of 0.75 m. What will its ﬁnal speed be? Answer in units of m/s

### Physics

If a car is going .197 meters per second, how long will it take to go 5 kilometers (assuming the ground is perfectly flat).

### Physics

A ball rolling down a hill was displaced at 19.6m while uniformly accelerating from rest. If the final velocity was 5.00 m/s what was the rate of acceptation?

a rubber ball is thrown downwards off a balcony. after it travels 55m it has a speed of 46.5m/s. what is the initial velocity

### physics

If you push a box a distance of 2,000 meters with a force of 1 newton, how many Calories have you used? 1 Calorie= 4,187 Joules

### physics

What is the angular separation between the first-order images on either side of the central maximum? Answer in units of degrees.

### physics

A violin string vibrates at 298 Hz when unfingered. At what frequency will it vibrate if it is fingered one sixth of the way down from the end?

### 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

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

The coefficient of kinetic friction for a 22 kg bobsled on a track is 0.20. What force is required to push it down a 6.0° incline and achieve a speed of 64 km/h at the end of 75 m?

### physics

As a projectile shot at an upward angle rises and falls what happens to its horizontal component of its velocity if we neglect air resistance?

### Physics

In a vacuum, two particles have charges of q1 and q2, where q1 = +3.7 µC. They are separated by a distance of 0.22 m, and particle 1 experiences an attractive force of 3.5 N. What is q2 (magnitude and sign)?

### Physics

If you stood atop a ladder that was so tall that you were twice as far from Earth's center, how would your weight compare with its present value?

### physics

A ray of light goes through the centre of a semicircular glass disk, n = 1.58, and onto a wall (x = 19.4 cm, y = 5.06 cm). What is the incident angle, θ?

### Physics

How much charge is contained in 9kg of electrons? Express your answer to two significant figures and include the appropriate units.

### Physics

How much charge is contained in 9kg of protons? Express your answer to two significant figures and include the appropriate units.

### physics

What is the expected period of beats formed when two tuning forks sound simultaneously and have the frequencies f1= 250Hz and 242Hz?

### physics

a framed painting weighs 220 newtons. the 2 wires support an angle of 120 degrees with each other. what are the tensions on the wire?

### physics

Find the pottential energy of a boy of mass 10kg standing on a building floor 10 meters above the ground level p.e?

### physics

A 750 kg rocket accelerates straight upward from the ground at 60 m/s2. What is the force (thrust) provided by the engine? with a gravitational pull of 10 m/s2 down

### physics

you are driving up a long, inclined road . after 1.20 mi you notice that signs along the roadside indicate that your elevation has increased by 550 ft.

### physics

How far to the nearest tenth of a meter can a runner running at 10 m/s run in the time it takes a rock to fall from rest 99 meters?

### Physics

A 172 N sign is supported in a motionless position by two ropes that each make an angle of 36° with the horizontal. What force does each rope exert?

### physics

Five forces act on an object. (1) 57 N at 90° (2) 40 N at 0° (3) 77 N at 270° (4) 40 N at 180° (5) 50 N at 60° What are the magnitude and direction of a sixth force that would produce equilibrium?

### Physics

The peak wavelength and observed color of a 50,000 K star is 58nm and too blue to see with the human eye. True or False.

### physics

A 1200kg car travels at a constant speed of 12 m/s around a horizontal, circular track with a radius of 45m. What is the magnitude of the centripetal for