Math/Physics

206,302 results, page 83

Physics

Calculate the magnetic flux density in air at a point 15mm from a long straight wire carrying a current of 100A

physics

A car is heading towards a brick wall at 80 km/hr, he starts breaking 30 feet away. What acceleration is required to avoid a collision?

Physics II

Find the work done in pulling a 120 gram box in an incline plane, 150 cm long and 90 cm high if the coefficient of friction is 0.25.

physics

A 0.15 kg ball is attached to the end of a 0.82 m string and moved in a horizontal circle at 4.3 m/s what net force is needed to keep it in a circular path

physics

How much time would Simpson save by in- creasing his average velocity to 105 km/h to the east? Answer in units of min

Physics

An object is in free fall. At one instant, it is traveling at 41 m/s. Exactly 3.2 s later, what is its speed? The acceleration of gravity is 9.8 m/s2 . Answer in units of m/s

physics 180

a gazelle attempts to leap a 1.8 meter fence. assuming a 45 degree takeoff angle, what's the minimum speed for the jump?

Physics- science

An automobile with an initial speed of 4.82 m/s accelerates uniformly at the rate of 2.2 m/s2. Find the displacement of the car after 5.9 s. Answer in units of m

physics

A 300 kg sailboat accelerates at 0.5 m/s^2 at an angle of 25degrees North of East. Find the magnitude and direction of the force responsible for this accelereation.

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 91 meters

physics help please

An airplane that can fly at 300 km/hr is flying at 210 when it is hit by a wind of 125 km/hr at 110. What is the new velocity of the plan?

physics

For an object travelling at a constant velocity, how does the dispalcement change over equal time intervals? I do not understand this question pls help.

physics

A diver leaves the board traveling at 3.5 m/s at an angle of 75º with respect to the horizontal. What is her speed when she hits the water, 3 meters below?

physics

If Joe rides south on his bicycle in a straight line for 26 min with an average speed of 11.6 km/h, how far has he ridden? Answer in units of km

Physics

The coefficient of kinetic friction for a 22 kg bobsled on a track is 0.15. 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

An outfielder throws a 0.150-kg baseball at a speed of 50.0 m/s and an initial angle of 30.0°. What is the kinetic energy of the ball at the highest point of its motion?

physics

How far to the nearest tenth of a meter can a runner running at 15 m/s run in the time it takes a rock to fall from rest 68 meters?

Physics

what is the moment of interia of a solid cylinder of radius R=0.0950m thickness t=0.015m total mass M=3.565kg? show your work

Physics

A roller coaster moves 4.2 m horizontally, then travels 6.9 m at an angle of 30º above the horizontal. What is the resultant displacement from its starting point?

physics

a cannonball is fired horizontally straight up at a modest speed of 9.8. Compute its maximum altitude and the time it takes to reach that height

physics

what force is needed to accelerate at child on a sled at 1.4 meters per second square (total mass 55 kilo gram)

physics

A bird is sitting on a wire 22m long. The wind makes it move, creating a standing wave with 8 loops. What is the wavelength?

physics

A teacher is shot out of a cannon. He leaves the barrel at an angle of 25.0o to the ground with a velocity of 45.0 m/s. How far down range will he land?

physics

A 4.5 kg object is accelerated from rest to a speed of 39.2 m/s in 76 s. What average force was exerted on the ob- ject during this period of acceleration? Answer in units of N

physics

true of false- if you only want a small volume of hot water, you should place the immersion heater near the bottom?

Physics

A large merry-go-round completes one revolution every 17.5 s. Compute the acceleration of a child seated on it, a distance of 5.80 m from its center.

Physics Honors

A pitcher throws a fast ball horizontally at 42.1 m/s How far does it drop before crossing the plate, 18.3 meters away?

physics

Brookney kicks a soccerball with a speed of 17m/s at 43 degress above the horizon. How far does the ball go before it hits the ground?

physics

a car is pushed along at 2.50 times 10^3 kg from rest creating 5000 joules of work. It moves 25 meters. what is the horizontal force ?

Physics

How long does it take a plane, traveling at a speed of 170 m/s, to fly once around a circle whose radius is 3500 m?

Physics

A baseball was hit at 45m/s at an angle of 45 degrees above the horizontal. How long did it remain in the air? How far did it travel horizontally?

physics

What is the take off speed of a locust if its launch at an angle of 60 and its range 88m. Also calculate the time of flight (g=10m)

Physics

What is the rotational inertia of a solid iron disk of mass 45 kg, with a thickness of 3.44 cm and radius of 19.0 cm, about an axis through its center and perpendicular to it?

Physics

An airplane with an airspeed of 33.3 m/s is headed 30 degrees east of north in a wind blowing due west at 30 m/s. What is the ground speed of the plane?

physics

consider the loop in the figure. The area=600m, and it spins with angular velocity =40.0 rad/s in a magnetic field of strnght B=.400 T

physics

A bat at rest sends out ultrasonic sound waves at 51.1 and receives them returned from an object moving directly away from it at 22.3 .

physics

a gymnast tumbles forward 4.0m does cartwheels to the left for 6.0 m and climb a vertical rope to a height of 3.0m. What is the magnitude of the plane's displacement from the airport?

physics

Question Part Points Submissions Used A bus slows down uniformly from 75.0 km/h (21 m/s) to 0.0 km/h in 220 m. How long does it take to stop?

physics

what is the length of the shortest pipe closed on one end that will have a fundamental frequency of 60 hz on a day when the velocity of sound is 340 m/s?

physics

A ball has a diameter of 3.86 cm and average density of 0.0836 g/cm3. What force is required to hold it completely submerged under water?

Physics

A 1200 N force is exerted on a 700 kg crate to move it across a loading dock. If the coefficient of friction is .50 what is the crates acceleration?

physics

the magnitude of 2 vectors are 4 and 5 units and the angle b/w them is 30,taking first vectoron x-axis.find the magnitudeof resultant vectorand its direction?

physics

find the effective weight of an astronuat ordinarily weighing 50kg when his rocket moves vertically upwards with 6gm acceleration

physics

A merry-go-round accelerating uniformly from rest achieves its operating speed of 3.4 rpm in 2 revolutions. What is the magnitude of the angular acceleration?

physics

A 15 kg box slides across the floor with an initial velocity of +7.6 m/s. It comes to a stop after sliding +14.8 m. How much friction was present?

physics

if you have and open end air column with a length of 75.0 cm and the fifth harmonic is 1175 hz, what is the fundamental frequency? what is the speed of the wave?

Physics

a bus moving at a speed of 20m/s begins to slow at a constant rate. Find how far it goes before stopping?

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 free-fall 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 yo-yo horizontally above his head so that the yo-yo has a centripetal acceleration of 275 m/s2. If the yo-yo's string is 0.55 m long, what is the yo-yo'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 350-Hz 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 1200-kg 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?

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