# Math/Physics

206,551 results, page 66

### physics (electric charges)

Hi, How can you charge an electroscope negatively? Is it by using a positively charged rod? Can someone please help me? Thank you :)

### physics (electric charges)

Hi, How can you charge an electroscope negatively? Is it by using a positively charged rod? Can someone please help me? Thank you :)

### college physics

Estimate the rotational kinetic energy of Earth, assuming it to be a solid sphere of uniform density.

### physics

how old would you be, when you returned from a trip while traveling at 99.5% C if your relatives that stayed at home, were 10 years older?

### physics

An elevator weighting 2500 N ascends at a constant speed of 8 m/s. How much power must the motor supply to do this?

### Physics

Describe alpha, beta, and gamma rays. What exactly is each ray composed of? What are their characteristic radiation characteristics?

### physics

find the total momentum of electrons in a straight wire of lenght 1000m carrying a current of 70A.

### College physics

You have a collection of six 1.0 kilo ohm resistors. what is the smallest resistance you can make by combining them

### Physics

Two objects are moving in different direction. Under what circumstances can you treat this as one-dimensional problem?

### Physics

How much energy is need to place four positive charges, each of magnitude +5.0 mC, at the vertices of a square of side 2.5 cm?

### Physics

How much energy is need to place four positive charges, each of magnitude +5.0 mC, at the vertices of a square of side 2.5 cm?

### physics

Is the acceleration due to gravity more or less atop Mt. Everest than at sea level? Defend your answer.

### Physics

In a gas kept at a constant temperature, all molecules move with the same speed. True or false?

### physics

a plane travels 5.0 x 10^2 while being accelerated uniformly from rest at the rate of 5.0 m/s. what final velocity does it attain?

### physics

A boy sledding down a hill accelerates at 2.00 m/s2. If he started from rest, in what distance would he reach a speed of 5.20 m/s?

### Physics

A golf ball is chipped at an angle of 37 degrees and with a speed of 13.5 m/s. How far does it travel to the nearest tenth of a meter?

### physics

how long does it take a softball to cross homeplate at 43 feet if the ball is going 65 miles per hour?

### Physics

A student travels 6.0 m [E] in 3.0 s and then 10.0 m [N] in 4.0 s. Draw a vector diagram to determine the resultant displacement. Q: How do you know where the starting point is on the graph?

### physics

a pendulum of length L=9.8m hangs in equilibrium and is given velocoity v=0.2m/s at its lowest point.What is the magnitude of the subsequent oscillation?

### Physics

h t t p : / / b i t . l y / 9 S F F F o a) What is the minimum value of F needed to move the two blocks? b) If the force is 10% greater than your answer for (a), what is the acceleration of each block?

### Physics

h t t p : / / b i t . l y / 9 S F F F o a) What is the minimum value of F needed to move the two blocks? b) If the force is 10% greater than your answer for (a), what is the acceleration of each block?

### physics

a pendulum of length L=9.8m hangs in equilibrium and is then given velocity v=0.2m/s at its lowest point.What is the magnitude of the subsequent oscillation?

### physics

how long do waves of frequency 7 hz and wavelength 5cm take to travel across a pool breadth 3.5 metres

### physics

An athlete executing a long jumper leaves the ground at a 27.0 degree angle and travels 7.89 m. What was the takeoff speed?

### physics

what is your age in seconds? this is a conversion problem. someone help please with all the multiplication and division... very confused. THANK YOU

### physics

what is the shortest possible time in which a bacterium could travel a distanceof 8.4 cm across a petri dish at a constant speed of 3.5 mm/s

### physics

The pendulum swings past the pole 14 times in 21 seconds. The weight of the bob is 10g. Calculate the period?

### physics

A 1600 kg car traveling at a speed of 31 m/s skids to a halt on wet concrete where uk = 0.60. how long are the skid marks?

### physics

A train is traveling up a 3.6 incline at a speed of 3.30 when the last car breaks free and begins to coast without friction.

### physics

How long will it take an 850 kg car with 40 hp (horsepower) to reach the speed of 15 m/2, neglecting friction? 40 hp=29840 watts I know P=W/t but what is W?

### physics

If a person does 80 J of work in moving a 30 \rm{kg} box over a 13 m distance on a horizontal surface, what is the minimum force required?

### Physics

a 10-kg bos slides down a frictionless ramp with acceleration 3.6 m/s calculate the weight....the angle and normal force

### Physics

a 10-kg bos slides down a frictionless ramp with acceleration 3.6 m/s calculate the weight....the angle and normal force

### Physics

a 10-kg bos slides down a frictionless ramp with acceleration 3.6 m/s calculate the weight....the angle and normal force

### Physics

is it true or false the monochromatic light has photons of different energies? PLZ DNT 4GET 2 XPLAIN IT

### physics

A car traveling at 7.3 m/s accelerates 4.5 m/s2 to reach a speed of 11.0 m/s. How long does it take for this acceleration to occur? Answer in units of s.

### Physics

A child slides down a hill on a toboggan with an acceleration of 1.5 m/s squared. If she starts at rest, how far has she traveled in 1.0 s, 2.0 s, and 3.0 s?

### physics

A longjumper running at 12 m/s and jumps at 20 degrees. No wind or resistance but gravity is normal -9.81 m/s2. How far will person jump?

### Physics

A soccer player launches a ball at an angle of 40 degrees, with an initial velocity of 23 m/s. What are the horizantal and vertical for this problem??

### physics

A 4600 kg helicopter accelerates upward at 2.26 m/s2. 2 The acceleration of gravity is 9.8 m/s . What lift force is exerted by the air on the propellers?

### physics

A 4600 kg helicopter accelerates upward at 2.26 m/s2. 2 The acceleration of gravity is 9.8 m/s . What lift force is exerted by the air on the propellers?

### physics

A large boulder is ejected vertically upward from a volcano with an initial speed of 41.0 . Air resistance may be ignored.

### physics

A boy sledding down a hill accelerates at 1.30 m/s2. If he started from rest, in what distance would he reach a speed of 8.00 m/s?

### physics

A satellite orbits at an average altitude of h = 409 km. What is its orbital speed? Use REarth = 6370 km and mEarth = 5.98 x 10^24 kg

### physics

What minimum speed does a 150 g puck need to make it to the top of a 5.90 m-long, 21.0 degree frictionless ramp?

### Physics

If 500 grams of a metal requires 70 calories of energy to raise its temperature by 10 Kelvin, what is its specific heat?

### Physics

Calculate the earth's orbital angular speed in radians/sec due to its motion around th sun.

### physics

Find the angular speed of the Earth as it spins about its axis. Give your result in rad/ses

### Physics

Is momentum conserved when a cannon is rigidly mounted to the deck of a large boat and subsequently fired. What will happen and why?

### Physics

A car traveling initially at 7.49 m/s acceler- ates at the rate of 0.743 m/s2 for 5.41 s. What is its velocity at the end of the accel- eration?

### physics

A person has a mass of 50.0 kg. What is the pressure they exert on the blades of their ice skates if each skate blade is 15.0 cm long and 5.00 mm wide?

### physics

You should expect concrete to have an elastic constant that is _____ than wood. a. larger than b. smaller than c. equal to

### Physics

Does an object moving in a circle obey the law of inertia? Which way would it move if there were no net force on it?

### physics

A truck increases its speed from 8 m/s to 28 m/s over a distance of 120 m? How long does this take? Assume that the acceleration is constant

### Physics

Use the Second law of thermodynamics to explain why an ice cube cools off your warm soda.

### PHYSICS

What is the reaction effect of the following action effects? a) Earth orbits the sun b) Ball accelerates downward Thank YOu.

### PHYSICS

What is the reaction effect of the following action effects? a) Earth orbits the sun b) Ball accelerates downward Thank YOu.

### Physics

What is the gravitational force between the proton (1.67X10^-27 kg) and the electron (9.11X 10^-31 kg) in a hydrogen atom if they are 3.00X10^-10 m apart?

### Physics

i have to build a enery effiecient vehicle for class and do a opapp paper and i need help im so confused.... any ideas?

### physics

A bird is flying from the ground to the top of a tree at 5 m/s at an angle of 24 degrees. What are the horizontal and vertical components of this velocity?

### physics

What is the longest wavelength for standing sound waves in a 102.0 cm long tube that is open at both ends?

### Physics: Waves in Media

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

The displacement from the equilibrium caused by a wave on a string is given by: y(x, t) = (-0.00200 m) sin [40 m-1)x – (800 s-1)t]. What are the number of waves in 1 m

### physics

The pulley in Figure P8.59 has a moment of inertia of 7.0 kg·m2 and a radius of 0.50 m. The cord supporting the masses m1 and m2 does not slip, and the axle is frictionless.

### physics

as an object is dropped from a high cliff, which of the following statistics can be made in regard to the objects potential energy?

### Physics

The frequency of an electon orbiting a nyclear is 1000000000 cps and the radius is 5 * 10 to the -12m. Find the velocity of the electron.

### Physics

Could a simple machine such as a lever, a pulley system or a hydraulic jack be considered a heat engine?

### physics 11

a small 900kg sports car can deliver 100Hp to the pavement. how quickly can it reach 30m/s from rest?

### Physics Honnors

A 15 kg block of wood is sitting on a 1.5 meter high shelf. Calculate its gravitational potential energy

### Physics

A block weighing 9.7 N requires a force of 2.6 N to push it along at constant velocity. What is the coefficient of friction for the surface?

### Physics

An unbalanced forced of 2.5x10^3N is applied to an object with a weight of 3.0x10^3N on a frictionless surface. What is the objects acceleration?

### Physics

An object is dropped from rest. What is its instantaneous speed when it has been in motion for 5 s? The acceleration of gravity is 9.8 m/s2 . Answer in units of m/s

### physics

What is the net force on a Mercedes convertible traveling along a straight road at a steady speed of 100km/h?

### physics

What is the force required to move a 22kg ccrate up an incline of 35 degrees, if the coefficient between the two surfaces is .30?

### physics

A block weighing 6.8 N requires a force of 2.9 N to push it along at constant velocity. What is the coefficient of friction for the surface?

### Physics

What is gravitational force of a 65kg person that is on the surface of the moon has a mass of 7.348 x 10^22kg and radius of 1731km?

### physics

the mathematical form of the thin-lens equation predicts that a graph of 1/p vs 1/q should have a slope of -1, explain?

### physics

a 5kg suitcase slides 2m down a frictionless ramp incline at 45 degress. How fast is it going at the bottom?

### physics

The boats have a mass of 30 kg. The stopping splash lasted about 1.5 s. What acceleration is required to stop the flume?

### physics

calculate the free electrons of a copper wire having a 0.064 inches diameter and 1000 ft. long?

### Physics

A golf ball is chipped at an angle of 49 degrees and with a speed of 8.5 m/s. How far does it travel to the nearest tenth of a meter?

### physics

When a satellite moves in a circular orbit around a planet, does it have constant momentum, velocity or acceleration?

### physics

how can i plan and design a lab to investigate how electric current causes contraction of a spiral wire spring

### 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

How much energy in kilocalories is expended against gravity alone by a 75- kg man climbing 1500 m up a mountain?

### Physics

the relationship between linear speed and net force is inverse right? can someone explain why to me please.

### physics

A cylindrical container 1.7 tall contains mercury to a certain depth, . The rest of the cylinder is filled with water

### physics

A proton of mass mp = 1.67 x 10-27 kg and charge +e = 1.60 x 10-19 C is accelerated from rest through an electric potential of 400 kV. What is its final velocity?

### 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

3. If a man does 300 j or work by pushing a table 2.0 m across the room, what was the magnitude of the applied horizontal force?

### physics

A motorbike accelerates uniformly at 0.6m.s for 10s. If it covers a distance of 500m. During this time, what was its initial velocity?

### Physics

How fast (in rpm ) must a centrifuge rotate if a particle 8.00 from the axis of rotation is to experience an acceleration of 117000g's?

### physics

An egg falls from rest atop a 15-m tall tree. Show that it takes 1.7s for it to hit the ground below.

### physics

Stand on a 200 meter high building and, at noon, drop a ball. At what time does it hit the ground

### physics

Through the process of doing work, what allows energy to move between the external world and the system? the result of what???

### 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 rock is thrown upward at an angle of 50 degrees with respect to the horizon. As it rises, its vertical component of velocity does what?