# Math/Physics

209,467 results, page 49

### physics

what force is acting on a circular platform rotating opposite of a person standing on the edge?

### physics

a ball moves with a constant speed of 4 m/s around a circle of radius 0.25 m. what is the period of the motion?

### physics

A projectile is launched straight upwards at 45 m/s. Three seconds later, its velocity is A. 75 m/s B. 30 m/s C. 15 m/s D. zero

### physics

How high must a 2.0-kg basketball be thrown so that the top of its arc, it has a potential energy of 160 J?

### PHYSICS!!!

By how many decibels does the sound intensity from a point source decrease if you increase the distance to it by a factor 6?

### physics

how much work is being done if a 100 N box is lifted 3 meters off the ground???

### Physics

If a clock says 10:30 am and the second hand rotates 960 degrees what time would it be?

### physics

the period of revolution of a satellite is 90 min. Find the radius of the orbit assuming an acceleration of 9.8 m/s/s.

### physics

Describe how the energy from a rotating flywheel can be transferred to moving parts of a child's toy.

### physics

explain examples of physical laws used during the Apollo 13 mission to get it home

### physics

a mass 3 kg is dropped from a 20m high stand how long does it take to reach the ground?

### physics

a mass 3 kg is dropped from a 20m high stand how long does it take to reach the ground?

### Physics

How much force is needed to make a 1,400 kg car moving at 35 m/s come to a stop in 5.2s?

### Physics

How much force is needed to make a 1,400 kg car moving at 35 m/s come to a stop in 5.2s?

### physics

How can I calculate exactly where a marble will drop if it is rolling of a table with very little friction??

### physics

the frequency of yellow lights is 5.00 x 10^14 Hz. if it travels through space (where v= 3.00 x 10^8m/s) find the wavelength of this light.

### physics

if a man weighing 80 kg falls from 20000 feet , what would be his weght when he hits the ground?

### physics

a 150g-iron ball at 95 Celsius is dropped into a cavity in a block of ice

### Physics 112

Two point charges, +3.18 µC and -6.40 µC, are separated by 1.32 m. What is the electric potential midway between them?

### 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

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

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 fast must a roller coaster be going to get around a vertical loop with a radius of 15 m

### physics

Work out the gravitational potential energy of a 2kg brick at a height of 9 metres.

### physics

How many electrons must be removed from an electrically neutral silver dollar to give it a charge of +2.1 µC?

### physics

Approximate the gravitational force of attraction between a 49.0 kg girl and a 52.0 kg boy if they are sitting 2.5 m apart

### physics

Why does cross sectional area of a liquid stream reduces while falling vertically??

### physics

a nurse counts 76 beats in one minute. what are the period and frequency of the hearts oscillations?

### physics

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

### 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

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

### Physics

How far does a point on the circumference travel if the wheel is rotated through an angle of 28.6 rads?

### physics

Help me please to Find the tension in the two wires that supoort the light fixture. M=13 kg, è=43 degrees???!!

### physics

determine the speed of a mass (1.00kg) after it has fallen a vertical distance of 12.5 meters

### Physics

What is the time lapse between seeing the lightning strick and hearing the thunder 17 km away

### physics

what is the frequncy per minute of a skater making rounds at rink with radius of 2.5 m of her speed is 5 km/hr?

### Physics

Calculate the speed of an 7.8×104 kg airliner with a kinetic energy of 1.0 × 109 J. Answer in units of m/s.

### Physics

How much work must be done to accelerate an 8x105 kg train: a) from 10 m/s to 15 m/s; b) from 15 m/s to 20 m/s; c) to a stop an initial speed of 20 m/s?

### Physics

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

### Physics

A 1300 kg sports car accelerates from rest to 85 km/h in 6.2 s. What is the average power delivered by the engine?

### Physics

Calculate the distance (in km)that Larry runs if he maintains an average speed of 8km/hr for 45 minutes.

### physics

how much should a ramp rise over 10 meters of run for an angle of 12 degrees

### physics

5. What is the electric potential at the center of the square shown in the figure below? Assume that q1 = 1 x 10-8 C, q2 = -2 x 10-8 C, q3 = 3 x 10-8 C, q4 = 2 x 10-8 C and d = 1 meter.

### physics

What is the electric potential at the center of the square shown in the figure below? Assume that q1 = 1 x 10-8 C, q2 = -2 x 10-8 C, q3 = 3 x 10-8 C, q4 = 2 x 10-8 C and d = 1 meter.

### physics

How far will a car moving at 50 miles an hour travel in the time it takes to sneeze?

### physics

A hunk of cast concrete with a weight of 10 N will float if it displaces 10 N of water true or false

### Physics

Will a cyclist coast farther if the lamp connected to his generator is turned off? Explain.

### Physics

Given that q = +17 mu C and d = 14 cm, find the magnitude of the net electrostatic force exerted on the point charge q2.

### physics

Forces of 3 N and 4 N act the right angles on a block of mass 5 kg. Show that the resulting acceleration is 1 m/s².

### physics

what is the wavelength of radar waves with the frequency of 6.0*10^10Hz? a. 0.0010m b.0.010m c.0.050m d.0.0050m

### Physics

explain the concept of electric potential difference in terms of work done in transferring the charge

### Physics

explain the concept of electric potential difference in terms of work done in transferring the charge

### physics

what potential difference delta V is required to accelerate protons from the rest to 10% of the speed of light?

### physics

Find the rms speed of H2O molecules in atmospheric water vapor at a temperature of 13.2° C.

### physics

Evaluate the Rydberg constant R using Bohr theory and show that its value is R = 1.0974x10-1.

### physics

the density of a block of wood with a colume of 50 cubic centimeters and a mass of 10o grams is

### physics

How much charge flows through a 12 V battery when a 2 ìC capacitor is connected across its terminal?

### physics

If an 80kg sprinter can accelerate from a standing start to a speed of 10 m/s in 3s, what average power is generated

### physics

What is the mass of a lead sinker witha volume of 3cm3? please show work Thank you

### physics

What is the net force on a rock that weighs 500N if the weight of the water it displaces is 300N?

### physics

Find the minimum kinetic energy needed for a 3.7×104-kg rocket to escape the Moon.

### physics

claculate the force of gravity between two identical balls 8kg each, if they are 5m apart?

### physics

claculate the force of gravity between two identical balls 8kg each, if they are 5m apart?

### physics

what is the value of electric field intesity at a point between two co centric sphere

### physics

what is the magnitude and direction of the electric field 20.0 cm cm directly above an isolated 33.0 10 neg6 c charge?

### Physics

A body of mass m moves under the influence of force F(r). Given it's trayectory r(t), find F(r).

### Physics

A body of mass m moves under the influence of force F(r). Given it's trayectory r(t), find F(r).

### Physics

A body of mass m moves under the influence of force F(r). Given it's trayectory r(t), find F(r).

### Physics

How many moles are there in a 30 cm diameter basketball at a pressure of 160 kpa and temperature of 25 degree celcius.

### 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

Does the period of a satellite in a circular orbit increase or decrease as its distance from earth increases? Thanks :)

### physics

the value of acceleration due to gravity is not equal to 10m,give reasons to support

### Physics

A player kicks a footbal with a velocity of 27 m/s at an angle of 31° with the ground. How high does the ball travel?

### Science

Name 3 physical (physics) occurances that happen within a roller coaster ride?

### physics

find the mass of the moon if its radius is 1.76*1000000 m and the average density is 4*1000kg/m cube

### physics

state the energy hans-formation which occurs when a car is brought to rest by its break

### physics

Consider the relation w=2 q t^2/m^3. How would w change if m wre increased by a factor of 2? Thank you very much...

### Physics

To move 8.0 of charge from one electrode to the other, a 12- battery must do how much work?

### physics

What is force of attraction between two students of mass 20kg,10meters apart?

### physics

What is force of attraction between two students of mass 20kg,10meters apart?

### physics

How much force does an 60 kg astronaut exert on his chair while accelerating straight up at 8m/s squared?

### physics

How much force does an 60 kg astronaut exert on his chair while accelerating straight up at 8m/s squared?

### Physics

If a 70g swimmer pushes off a pool wall with a force of250n, what is her acceleration?

### Physics

An object rotates at 3.0 rpm(revloutions per minute). What is the magnitude of its angular velocity?

### physics

a spring has a force constant of 20000 N/m how far must it be strectched for its potential energy to be 43 J??

### Physics

What hanging mass will stretch a 1.9-m-long, 0.54mm - diameter steel wire by 1.2mm ?

### Physics

A spherical piece of metal has a radius of .250m and a mass of 503 kg. what is its specific gravity?

### Physics

Does the composition of an object affect the final temperature of in objects. This is in terms of thermal equilibrium.

### physics

A 5.0 m diameter merry-go-round is initially turning with a 4.6 s period. What is the speed of a child on the rim?

### physics

A space vehicle accelerates uniformly from 50m/s at t=0 to 182m/s at t=1 0.0s. How far did it move between t=2.0s and t=6.0s?

### physics

if a bowling ball with a 22 cm diameter is half way submerged in a bucket of water, what is its mass?

### physics

what causes an object to experience an artificial gravitational acceleration in a rotating space station

### physics

Is the mass of an object has an effect velocity with it land on the ground when freely falling from rest?

### physics

find the bouyant force on a copper obect that displaces 2.8 meters cubed of water

### physics

find the acceleration of a 3 kg mass as it moves with a constant speed of 4 m/s along a circle of radius 2 m.

### physics

A car moves at a constant speed of 24m/s. How long (in minutes) will it take to travel 15.0 km?

### physics

A car and a motorbike both are running at the same speed. Which of the two has greater momentum and why?

### physics

A car starts from rest and accelerates for 6.1 s with an acceleration of 3.1 m/s2. How far does it travel? Answer in units of m.

### physics

Resultant displacement from 12m east to5m north to9m vertically upward