Math/Physics
212,527 results, page 85

physics
What is the initial height big an object if, when dropped from rest , its kinetic energy is 21J 2/3 of the way towards the ground? The mass is 5 
physics
A body of mass 2 kg is dropped from the top of a tower of height 100m. If the acceleration due to gravity is 10 m/s2 calculate the K.E at the end of 5 seconds 
physics
need help can someone please tell me Electricity is often converted into other forms of energy. List 3 examples. 
Physics
how far to the nearest tenth of a meter can a runner running at 7.9 m/s run in the time it takes a rock to fall from rest 65 meters? 
physics
A car traveling at 70 km/h. It then accelerates at 3.6m/s^2 to 90km/h. How long does it take to reach a new speed. How far does it travel during acceleration 
Physics
A ball is thrown at 21m/s at 30degree above the horizontal from the top of a roof 16m high.calculate the time of flight 
physics
A car traveling at 60km/h. It then accelerates at 3.6m/s^2.How long does it take to reach a new speed. How far does it travel during acceleration. 
physics  ohms law
how hot would a copper wire need to be for its resistance to be 2% larger than its value at room temperature (20 Centigrade)? 
Physics
How far to the nearest tenth of a meter can a runner running at 9 m/s run in the time it takes a rock to fall from rest 73 meters? 
physics
Find the angular velocity of a body rotating with an acceleration of 2 rev/s square as it completes the 5th revolution after the start. 
physics
an object of mass 1kg falls a distance 5m on a horizontal surface and bounce to a vertical height of 2m.calculate the change in momentum 
physics
An object glides on a horizontal tabletop with a coefficient of kinetic friction of 0.65. If it comes to rest after 0.9 seconds, what was its initial velocity? 
Physics
A weight lifter performs a clean and jerk on 150 kg, raising it 2 m above the ground in 1.5 s. What is his power output during the lift? 
Physics
A car whose brakes are locked skids to a stop in 200 ft from an initial velocity of 50 mi/hr. Find the coefficient of sliding friction. 
Physics
How much force is needed to bring a 3200 lb car from rest to a velocity of 44 ft/s in 8 seconds? Please indicate the formula used. 
PHYSICS
A pebble is tossed off a skyscraper and reaches the groung 7.65 seconds later. How tall is this building? 7.65 s x 9.8 m/s^2 = 74.97 meters????? Not sure if I did this right? Thanks 
Physics
A man carries a 10 kg sack of groceries in his arms with a force of 50 N as he walks forward a distance of 10 m. How much work has he done? Is this a trick question? 
physics
A wooden cube of side 10cm has mass 700g.What part of it remains above the water surface while floating? 
Physics
What is the freefall acceleration in a location where the period of a 0.594 m long pendulum is 1.55 s s? Answer in units of m/s^2 Show equation too please. 
physics
A 68.0 kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.770 and 0.470, respectively. 
Physics??
A car is traveling at a speed of 62 on a freeway. If its tires have diameter 24.0 and are rolling without sliding or slipping, what is their angular velocity? 
physics
How far to the nearest tenth of a meter can a runner running at 11 m/s run in the time it takes a rock to fall from rest 78 meters? 
physics
A young boy swings a yoyo horizontally above his head so that the yoyo has a centripetal acceleration of 275 m/s2. If the yoyo's string is 0.55 m long, what is the yoyo's tangential speed? 
physics
What change in kinetic energy does an airplane experience on takeoff if it is moved a distance of 600 m by a sustained net force of 5400 N? 
physics
A small rocket is fired directly upwards with an initial velocity of 100m/s, How many seconds will it take to reach its maximum height? 
physics
Calculate the hang time of a person who moves horizontally 2.00 m during a 1.23 m high jump. Express your answer with the appropriate units 
physics
what is curie temperature?what is a fermi energy level?what is its position in case of an intrinsic semi conductor?what is a thermal neutron?what is its importance? 
Physics
The fastest helicopter, the Westland Lynx, has a mass of 3.343 x 103 kg and a maximum momentum of 3.723 x 105 kg.m/s. What is its top speed? 
physics
For which of these will the buoyant force be the same as its weight when placed in water? A) A match stick.B) All of these.C) A small rock.D) None of these.E) A nail. 
physics
A 350Hz tuning fork is held above a closed pipe. Find the spacings between the resonances when the air temperature is 20°C. 
physics
Use these magnitudes of the forces of gravity at Earth's surface to determine the masses of the objects on which they act A)0.98N. B)62N C)44.5MN 
physics
Use these magnitudes of the forces of gravity at Earth's surface to determine the masses of the objects on which they act A)0.98N. B)62N C)44.5MN 
Physics
A 185kg refrigerator is loaded into a van by moving it up a 10.0m long frictionless ramp that is at an angle of 11.0 degrees. How much work is done? 
Physics
What is the kinetic and potential energy of a Boeing 747 airliner weighing 2.48 106 N, flying at 268 m/s (i.e., 600 mi/h) at an altitude of 6.2 km (i.e., 20 103 ft)? 
Physics
What is the wavelength of a radar signal that has a frequency of 30 GHz? The speed of light is 3 × 10^8 m/s. Answer in units of m Giving me the formula is just fine 
physics
So if I have two light bulbs with different wattage how could I show what happens to them in series and parallel. The voltage remains the same. 
physics
A violin string vibrates at 440 Hz when unfingered. At what frequency will it vibrate if it is fingered one fourth of the way down from the end? 
physics
How much energy expressed in units of food Calories (that is, kilocalories) is required to operate a 100 W light bulb for 14.70 hours? 
Physics
A monoatomic gas expands isobarically.What will be the percentage of heat supplied that increases the thermal energy and that involved in doing work for expansion? 
HELP PLEASE PHYSICS!!
How much does it cost to operate a 100 W lamp continuously for 1 week if the power utility rate is 8/kWh? answer in $ 
Physics
An auto race is held on a circular track. A car completes one lap in a time of 19.2 s, with an average tangential speed of 39.8 m/s 
physics
Fruity Florida farmers fecklessly fling flying fountains of water on the fruit during cold snaps. Explain why they do this 
physics
A body of mass 300g movers in a circle of 4m at a uniform speed of 12m/s. Calculate the angular velocity and the tripetal force 
physics
If I throw a baseball horizontally off of a 100m tower at a velocity of 3.33m/s how long will it take the ball to fall to the ground? 
physics
A ball droppred from a tall building find the balls velocity after 7 seconds show all works please 
Physics
A helium balloon is tied to a brick and dropped into the lake. As the balloo sinks the buoyant force acting on decrease. 
Physics
A 1200kg frictionless roller coaster starts from rest at a height of 24 m. What is its kinetic energy when it goes over a spot that is 12 m high? 
physics
one car moving on a straight road covers 1/3 of the distance with 20kmph and the rest with 60kmph find th average speed 
physics
a bullet initially moving with a velocity 20m/s strikes a target and comes to rest after penetrating a distance 10cm in 
Physics
If a person can have a hang time of .75 seconds, how long would it take that individual to go from the ground to the highest point of their jump? 
physics PLEASE I NEED HELP
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
What's the shortest air column , closed at one end, that will resonate at a frequency of 440.0Hz when the speed of sound is 352 m/s 
physics
a 1.0kg ball is thrown upward from 1.0m above the ground with a speed of 10m/s reaches a height of 4.5 m. what is the efficiency of the energy transformation? 
Physics
A basketball player throws a ball at an angle of 30º above the horizontal. At what point does the magnitude of the acceleration reach a minimum? 
Physics
Three charges (q1 = 8.7 nC, q2 = 7.2 nC, and q3 = 4.8 nC) are at the corners of a square of side a = 9.2 cm, as shown in the picture. Determine the magnitude of the resultant electric force on each charge. 
physics
A body moves along a straight line from rest with an acceleration of 2m/s². Calculate the time taken by it to cover a distance of 100m. 
physics
determine the tension in a cable needed to lift a 2000 kg elevator with an acceleration of 1.5 m/s.squared. How would you solve this? ): Which formula do you use? 
physics
Two forces of 5kg wt and 10kg wt are acting at an inclination of 120 o between them. Find the magnitude and direction of resultant force. 
Physics
A bug completes one lap along the edge of a circular planter of radius 22.4 cm in 16.45 s. How fast was it traveling? Answer in units of cm/s. 
physics
If the potential difference between a cloud and the ground is about 17 , how much charge is transferred in a lightning bolt that releases 1.2 of energy? 
physics
If we wanted a block of iron of mass 3.25 kg to acquire a positive charge of 0.100 C, what fraction of the electrons would we have to remove? 
physics
When moving at highway speed, a Triumph America motorcycle is capable of accelerating at 2.1 m/s2. At this rate, how long does it take to accelerate from 103 km/h to 88 km/h? 
PHYSICS
When moving at highway speed, a Triumph America motorcycle is capable of accelerating at 2.1 m/s2. At this rate, how long does it take to accelerate from 103 km/h to 88 km/h? 
Physics
If a satellite is orbitting the earth 710km above the earths surface, and it's velocity is 7,406.8 meters/sec, what is it's cetripedal acceleration?? 
physics
At highway speed, a particular car is capable of an acceleration of about 1.7m/s^2.At this rate how long does it take to accelerate from 90 km/h to 110 km/h? (in seconds) 
physics
what is the maximum speed at which automobile can round a curve of 100 ft radius on level if the coefficient of friction between the tires and the road is 0.35? 
physics
a car traveling in a straight line has a velcoity of 2.43 m/s at some instant. After 6.73 s, its velocity is 9.81 m/s. what is its average acceleration in this time interval? 
physics
a car traveling in a straight line has a velcoity of 2.43 m/s at some instant. After 6.73 s, its velocity is 9.81 m/s. what is its average acceleration in this time interval? 
physics
Research on the scientific principle involved in the inflation of an airbag. Explain how this device protects the driver and the front passenger from injuries. 
physics
Research on the scientific principle involved in the inflation of an airbag. Explain how this device protects the driver and the front passenger from injuries. 
Physics
If a ball is kicked at 35 degrees above the horizontal, what is the speed to barely clear the 3m tall goal post 60m away? 
physics
If a ball is kicked at 35 degrees above the horizontal, what is the speed to barely clear the 3m tall goal post 60m away? 
physics
a baseball is thrown at an angle of 24 degrees relative to the ground at a speed of 23.4m/s. the ball is caught 41.4798m from the thrower. how long is it in the air? 
physics
A diver steps off a cliff and dives from 40 meters into the ocean. How long will he fall before he hits the water? 
physics
The radius of a merrygoround is 7 meters, and it takes 12 seconds to make a complete revolution. What is the speed of an atom on the outer rim? 
physics
how long will it take a 1750watts motor to a lift a 285kg piano to a sixth storey window 1.6 meters above 
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?