# Math/Physics

206,302 results, page 68

### physics

How much centripetal force is needed to keep a 0.20 kg ball on a 1.50 m string moving in a circular path with a speed of 3.0 m/s?

### physics

radius of the earth = 6.37 × 10^6 what is the speed of a 90.6 kg person at the equator? I know that F=m(v^2/r) but I don't know the force. Is there another equation that I'm missing or I'm using the wrong one? Thanks

### physics

a hlicopter takes off and travles 300 km due north then returns to its landing field. what is its displacment?

### physics

How long will it take a 1030 W motor to lift a 330 kg piano to a sixth-story window 13.0 m above?

### physics

What is the minimum velocity needed for a roller coaster , traveling on the ground , to make it over a 112 m hill?

### honors physics

What is the minimum velocity for a tolerant coaster traveling on the ground to make it over 112 m hill

### science physics

i don't get how to solve this please help me Two resistors, 47 Ù and 82 Ù, are connected in series across a 45 V battery. What is the current in the circuit?

### Physics

calculate the initial speed of a bicyclist whose final velocity is 20m/s if he accelerates at a rate of 2 m/s2 in 5 seconds?

### physics

compute the least acceleration with which a man of mass 75 kg can slide down a rope which can sustain a weight of 580 N

### physics

Time() 0 2 4 6 8 10 12 14 16 Velocity() 0 0 2 5 10 15 20 22 22 By measuring the slope of your curve, find the magnitude of the instantaneous acceleration at times = 9s i don't know how to solve it

### physics

An airplane reaches a velocity of 71m/s^2 when it takes off. What must its acceleration be if the runway is 1.0km long

### physics

Who developed modern periodic table? Descibe particle arrangements & movement for each phase of matter. (Thank you for helping me)

### physics

An object is dropped from rest. What is its instantaneous speed when it has been in motion for 8 s? The acceleration of gravity is 9.8 m/s2 . Answer in units of m/s

### College Physics

An electron and a proton are a distance r = 8.5 × 10-9 m apart. How much energy is required to increase their separation by a factor of 6?

### physics

A 60kg boy is riding his bike to school. His acceleration is 15 m/sec^2. Determine the magnitude of the force he is exerting.

### Physics- moles and gas laws

What is the volume occupied by 8.0 g of hydrogen under a pressure of 2.8 atm and a temperature of 300 K?

### physics

When boiling water begins to turn to steam, which of the following remains the same in both the liquid and the vapor?

### physics

When boiling water begins to turn to steam, which of the following remains the same in both the liquid and the vapor?

### physics

An object is to be thrown through a window 3.5 m high a distance 7.5 m away. It is launched at an angle 70 degreesabove the horizontal.

### physics

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

### Physics

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

### 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

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

1. Explain how the ff. works: a. ultrasound imaging device b. photocopying machine c. microwave oven Thank you so much in advance! :)

### principles of physics

Calculate the change in potential energy of 7.8 million kg of water dropping 50 m over Niagara Falls.

### physics

jeritex mass is 60kg. if he climbs up the flight of stairs 13 meters high in 20 seconds, what is his power output?

### physics

a race car's velocity increases from 4 m/s time interval, its average acceleration would be 10 m/s2 ? true or false ?

### 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

If you pull one end of the rope 1.0 m downward with a 50 N force, find the height you can lift a 150 N load.

### Physics

What is the magnitude of buoyant force acting on a 720 cm^3 toy submarine floating in fresh water? (D_water =1 g/cm^3)

### Physics

Sunlight strikes a fused quartz surface. At what angle of incidence is the reflected light completely polarized?

### Physics

What minimum speed does a 100 g puck need to make it to the top of a 5.9 m-long, 29 degree frictionless ramp?

### physics

What is the power delivered by a motor lifting an elevator weighing 1250kg up 89 floors at 16.8 meters per second

### Physics. PLEASE HELP!!

Find the power input of a force F=(7 N)ˆý + (3 N) ˆk acting on a particle that moves with a velocity v = (6 m/s)ˆý. Answer in units of W

### Physics

Our eyes are sensitive to electromagnetic radiation with wavelengths from 400nm to 700nm. What is associated range of frequencies?

### physics

A motorcyclist increases her speed along a straight road from 0 to 120 km/hr in 5 seconds. How much acceleration does she experience

### physics

The grid in a high-vacuume triode is usually kept negatively charged with respect to the cathode so that the electrons may be

### physics

Which of these two bodies gets its internal heat from nuclear processes? A) Both.B) Sun.C) Neither.D) Earth.

### applied physics

Calculate the magnitude of the torque produced by two 25N forces that are 3m apart and in opposite directions

### Physics

A 0.5kg puck traveling in a horizontal circle of radius 3.2m has a frequency of 0.5Hz. what is the centripetal force on the cord?

### Physics

What is the upper tripper point (UTP) of a comparator with hysteresis if R1 = 47 kÙ, R2 = 68 kÙ and the maximum positive output voltage is 10V?

### physics

Determine the magnitude of the force of gravity acting on a 340 kg satellite, 850 km above Earth's surface

### physics

Determine the magnitude of the force of gravity acting on a 340 kg satellite , 850 km above Earth's surface.

### Physics. PLEASE HELP!!

When a 0.35 kg baseball is hit, its velocitychanges from 21 m/s to -29.5 m/s. What is the magnitude of the impulse de-livered by the bat to the ball? Answer in units of N · s

### physics

How long will it take a 1630 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?

### physics

Devise a method for measuring the coefficient of friction between two surfaces using an inclined plane

### Physics

Some hydrogen occupies 120 ft at 60.0°F. Find the temperature when its volume is 132ft^3 if the pressure remains constant.

### Physics

Some propane occupies 150 cm^3 at 12.4°C. Find the temperature when its volume is 132ft^3 if the pressure remains constant.

### physics

Some hydrogen occupies 120 ft at 60.0°F. Find the temperature when its volume is 132ft^3 if the pressure remains constant.

### physics

Given that the power consumed by a device is 1000 W operating on a 70-V line, calculate the amount of current it draws.

### physics

Given that the power consumed by a device is 1000 W operating on a 70-V line, calculate the amount of current it draws.

### physics

How much work does a refrigerator with a COP of 3.8 require to freeze 660 g of water already at its freezing point?

### physics help!

Using the Bohr model, estimate the wavelength ë of the Ká characteristic X-ray for a metal an atom of which contains Z = 50 protons.

### physics

Using the Bohr model, estimate the wavelength ë of the Ká characteristic X-ray for a metal an atom of which contains Z = 50 protons.

### physics

What frequency would you need to produce a sound wave in room-temperature air with a wavelength of 9 m? the answer in Hz

### physics

Beats in sound are the result of which of the follwing wave? A) resonance.B) refraction.C) reflections.D) amplitude changes.E) interference

### physics

The quality of a musical tone has to do with a variety of which of the following? A) amplitudes.B) sound speeds.C) intensities.D) decibels.E) harmonics.

### physics

Sound waves have which of these properties? A) Reflection.B) All of these.C) Refraction.D) Interference.E) Capable of producing beats.

### physics

is increasing the current a valid method to increase the induced voltage when a magnet moves into a solenoid?

### Physics

An object is executing circular orbits of radius 0.5 m. If it completes an orbit every 3 seconds, what is its tangential speed?

### Physics

Two persons A and B are walking with a speed of 4 km/h and 5 km/h respectively in the same direction. Find how far will B be from A after 3 hours ?

### physics

How much charge passes through a cross-sectional area of a copper wire in 0.8 s if I = 3.5 A? 1 C -Work equation?

### physics

A 2630-kg car drives up a hill 769 meters high in 41.0 seconds. Calculate the power exerted

### Physics

Vector A has magnitude 37 units and direction, counterclockwise from east, of 12.9 degrees. What is the value of its x component to 1 decimal place?

### physics

Calculate the cost of operating a 65 W light bulb continuously for a 30-day month when electrical energy costs $0.23/kW·h. $ 1

### physics

what has more inertia?a toy car going 1000 mph or a cruise ship sitting at the dock

### Physics

What magnitude of acceleration will result when 60N and 80N forces in opposite direction if applied to a 5kg body?

### Physics

A 0.2 kg glass cup at 20 C is filled with 0.4 kg of hot water at 70 C. Neglecting any heat losses to the environment, what is the equilibrium temperature?

### Physics

a truck is traveling in a straight line goes 60km in 83minutes. what is its average speed in km per hour?

### physics

Wally now lift the box of the floor and put it on a shelf. Does he doing any work? If not why? If so .what energy change is accurring?

### PHYSICS

A 60.0 kg rocket accelerates upward from rest reaching a height of 23.4 m in 3.0 seconds. what is the thrust force produced by the engine?

### Physics-please help quick!!

When the object is placed beyond 2f, where should you put your eyes for getting the clear image of it?

### physics

m1=4kg and m2=2kg and angle is 42 degrees.if the mass m2 is moving down with 0.5 m/s^2 acceleration, find the coefficient of the friction

### physics

What is the moment of inertia of a solid cylinder of radius R=0.9550m,thickness t= 0.015m, and total mass M= 3.565 kg?

### physics

a body is thrown vetically up from the ground passes the height 10.2 m twice at an interval of 10s .what was initial velocity?

### Physics

A proton moving at 500000m/s enters a series of charged parallel plates. What is the impact speed on the last plate.

### physics

How high will a 1.95 rock go from the point of release if thrown straight up by someone who does 66.5 of work on it? Neglect air resistance.

### Physics

What is the minimum work in joules needed to push a 1460 kg car 14.0 m up a 12.5 degree incline? (Ignore friction.)

### Physics

Calculate the velocity of a satellite moving in a stable circular orbit about the Earth at a height of 2600 km.

### physics

Find the distance by which a 43cm diameter, 8.7m tall concrete column is compressed when it supports a 12400kg load

### physics

two forces of 10N and 7N respectively are applied simultaneously to an object . The minimum value of their resultant is, in newtons?

### physics

A 326 g object is attached to a spring and oscillates with a period of 0.25 s. The total energy in this system is 5.83 J. What is the amplitude of the motion?

### PHysics

What is the total energy of a 15-kg mass attached to a spring oscillating horizontally with an amplitude of 20 cm and an angular frequency of 32 rad/s?

### physics

What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 6.8 m/s when going down a slope for 2.5 s?

### physics

How far to the nearest meter can a sprinter running at 9 m/s, travel in the time it takes a rock to fall 65 meters?

### Physics

Why is parallel circuit brighter compared to series? ( Only one bulb is present in both circuits) Thanks :)

### physics

why it is easier to tear a paper off a full roll than a mostly used one? Is it because of Newton's law?

### Physics

A boy sledding down a hill accelerates at 1.25 m/s2. If he started from rest, in what distance would he reach a speed of 5.00 m/s?

### Physics

A boy sledding down a hill accelerates at 1.25 m/s2. If he started from rest, in what distance would he reach a speed of 5.00 m/s?

### physics

A vehicle moves in a straight line with an acceleration of 5 km/h^2.By how much does the speed change each second?Answer in units of km/h

### physics

A vector points 34.8 degrees to the Northeast with magnitude 15. What are the north and east components that make up the remainder of the triangle?

### 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 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

The minivan your mom lets you drive accelerates from 12 m/s to 24 m/s in 6.5 s. How far does it travel in this time? Assume constant acceleration.

### Physics

An object with a mass of 3kg is dropped from 56.3 meters. How far above the ground is it's kinetic energy 1073J?

### physics

If a DeLorean rolls gently (vo = 0) off a vertical cliff, how long does it take it to reach a downward velocity of 78 km/h?

### PHYSICS

If a DeLorean rolls gently (vo = 0) off a vertical cliff, how long does it take it to reach a downward velocity of 78 km/h?

### Physics

How do I find Vector Resolution F = 0.300 g N, theta = 60 degrees. Do I take tan inverse (.3 sin 60/.3 cos 60)?

### physics

find the value of 60jule per minute on a system which has 10cm, 100gm and 1minute as fundamental unit