# Physics!

73,661 results, page 89

### Physics

A 103 kg sprinter wishes to accelerate from rest to a speed of 13.2 m/s in a distance of 19.3 m. What coefficient of static friction is required between the runners shoes and the track?

### Physics

What should the theoretical maximum value of the uniform acceleration of a object freely rolling down an inclined plane and what would the angle of elevation be?

### Physics

A cart released from rest at the top of a track 90. cm long takes 4.00 seconds to reach the bottom. determine the velocity after half the time.

### math-physics

How much work is done lifting a wrecking ball 6.50 m above the ground? So the formula for this problem would be: W=fs F=200kg S=6.50m (200)(6.50)=1300

### Physics

A solenoid 74.5 cm long has 350 turns and a radius of 2.26 cm. If it carries a current of 1.69 A, find the magnetic field along the axis at its center. Answer in units of T

### Physics

When maximum power is transferred to an external resistor R by a battery of emf E and internal resistance r, the ratio of r/R is? Answer 1:1 Can some please explain? Thankkks!

### physics

Two bodies of mass 3kg and 4kg are suspended at the ends of massless string passing over a frictionless pulley .the acceleration system is

### physics

A flywheel is making 180 r.p.m. and after 20 seconds it is running at 140 r.p.m. How many revolutions will it make, and what time will elapse before it stops, if the retardation is uniform ?

### Physics

A ball of mass 8 kg falls from rest from a height of 100 m. Neglecting air resistance, calculate its total energy after falling a distance of 40 m.

### AP Physics

A ball has an initial velocity of 3 m/s. If there is no friction, what is the highest it could roll? What would the qualitative bar graphs and energy flow diagram look like?

### Physics

Calculate the magnitude of the linear momen- tum for each of the following casesEarth (m = 5.98 × 1024 kg) moving with an orbital speed equal to 26200 m/s. Answer in units of kg · m/s.

### Physics- Start off good?

Estimate the moment of inertia of a bicycle wheel 67 cm in diameter. The rim of the tire have a combination mass of 1.1kg. (1.1)(67) = 73.3

### physics

A simple harmonic oscillator executes motion whose amplitude is .20 m and it completes 60 oscillations in 2 minutes Calculate its time period and angular frequency

### Physics

There is an 8 meter tall hill with a circular radius of 20 meters. What is yhe minimum speed a car needs to momentarily lose contact with the road?

### help! Physics

I've been getting this question wrong so many times! What is the relationship between the coefficient of friction and the time that it takes the object to reach the bottom of the ramp?

### Physics

A rocket moves upward, starting from rest with an acceleration of 26.3 m/s2 for 5.43 s. It runs out of fuel at the end of the 5.43 s but does not stop. How high does it rise above the ground?

### physics

how much force is required to stop a 100 mi/hr fastball? Assume the catcher's mitt stops the ball in 1 millisecond and the mass of a baseball is 145 g.

### physics

The steel I-beam in the drawing has a weight of 1.75 × 103 N and is being lifted at a constant velocity. The angles are at 70 degrees. What is the tension in each cable attached to its ends?

### Physics

If a person weighs 500 N on Earth, what would she weigh on Jupiter, where the acceleration due to gravity is 26 m/s2? Show all work leading to your answer.

### Physics

Radio waves travel at the speed of light, which is 3.00 ✕ 108 m/s. What is the wavelength for a FM station broadcasting at 97.9 MHz (the prefix M is "mega" and means 106)?

### physics

If the coefficient of kinetic friction between tires and dry pavement is 0.800, what is the shortest distance in which an automobile can be stopped by locking the brakes when traveling at 25.6m/s ?

### Physics

Calculate the tension in the string if a single pulley of velocity ratio 5 is used to raise a body of mass 200g through a distance of 4cm.

### Physics

How much work is needed to move a -8.00 uC charge from the ground to a point whose potential is +75.0V ? I know -8.00 uc = -0.8 x 10^-6 then I used W = Fd but I can't seems to get right answer any hint is appreciated.

### physics

four resistor of resistances 1ohm,2ohm,3ohm,5ohm, are connected in series and afterwards in parallel.calculate the combined resistance in each case

### Physics

charges of -6nC and 4nC are 3m apart.(a)Determine the force they exert on each other.(b) the net electric field intensity at a point midway between them.

### Physics

What weight could be supported by a rotating object if it had a mass of 98 grams and if it were revolving in a horizontal circle, 50 cm diameter, and making 240 rev/min?

### physics

How much time does a passerby on the sidewalk below have to move out of the way before the flowerpot hits the ground? Answer in units of s.

### Physics

A gun shoots a bullet at 1200 m/s at an angle of 600 above the horizontal. Neglecting air resistance, determine: a.) its time of flight b.) its range

### College Physics

A student throws a 140 g snowball at 7.5 m/s at the side of the schoolhouse, where it hits and sticks. What is the magnitude of the average force on the wall if the duration of the collision is 0.19 s ?

### Physics

1. Name three different kinds of graphs that are often used to plot information and discuss the value of each. i have no idea what the heck this means

### physics

Any ideas? A bird flying at 3m/'s west is given an acceleration of 1ms after five seconds what I'd it's velocity and how far has it travelled from its starting point?

### physics

an object of mass 10kg moves in a circle of radius 13m of uniform speed of 43m\s a) calculate the angular velocity b) the centripetal force

### physics

A uniform solid cylinder of mass 1kg rolls with out slipping on aflate surface at aspeed of pay/200rad/s how long will it be when they meet?

### Physics 12 college preparation

Find the work done by a traveller carrying a suitcase of mass 8.2 kg by pulling up on it when walking forward for a distance of 120 m . Explain your reasoning

### chemistry, physics

In the specific heat measurement does the sample have to be 100 C, or would a lower initial temperature do just aa well? I wrote down it doesn't matter, but i don't know why.

### physics

When a 80kg block of mass is pushed by 400 Newton at an angle of 37 degrees above the horizontal to accelerate from 20 m/s what will be the final velocity after 6 second

### Physics

A rocket moves upward, starting from rest with an acceleration of 34.4 m/s2 for 4.40 s. It runs out of fuel at the end of the 4.40 s but does not stop. How high does it rise above the ground?

### Physics

A machine of efficiency 80% is used to raise a load of body of mass 75kg through a vertical height of 3m in 30seconds.Calculate the power input.

### AP Physics 1

If electrical energy costs 12 cents, or \$0.12, per kilowatt-hour, how much does it cost to operate an electric over for 5.0 h if it carries a current of 20.0 A at 220 V?

### Physics

A police car approaches a large wall at 51m/s. Its siren emits a 980 Hz signal. What is the frequency of the reflected sound observed by the officer?

### physics

An electric train moving at 20kmh accelerates to a speed of 30kmh in 20 seconds.find the distance travelled in metres during the period of acceleration

### physics

A simple harmonic oscillator has a frequency of 2.05 Hz. What will be its amplitude of oscillation if it's started from its equillibrium position with a velocity of 1.9 m/s? Express your answer in m to three significant digits.

### physics

A window air conditioner consumes 900 W of electric power and has COP = 2.9.If it runs continuously for 24 h , how much heat gets removed from the house?

### Physics

A fighter jet is traveling at 200 m/s following the arc of a vertical circle of radius R. At the top of its path, the pilot experiences “weightlessness.” What is the value of R?

### Physics

Suppose that two concentric rings, each with equal mass per unit length are joined so that they rotate together. Find the moment of inertia.

### Physics

A spiral spring 20cm long is stretched to 25cm by a load of 50N.What will be its length when streched by 100N assumimg that the elastic limit is not reached?

### Physics

A crane lifts a Load of 50000g very slowly through a distance of 150cm vertically, calculate the work done against gravity if g=10.mls2

### Science physics

The least count of a screw gauge is 0.001cm the diameter of a wire measured by it is 0.225cm. Find out the percentage error in this measurement

### physics

a stone is projected vertically upward and reaches a maximum height of 20m before it returns to the thrower find the total time taken

### Physics

An astronaut constructs a pendulum with a length of 1 meter on a new planet. If the period is 3.9 second, what is the acceleration due to gravity? Can someone help me with formulas to determine this?

### Physics

Find the maximum height and the time of flight of a body fired vertically up from the ground given that it loses 60 percent of its initial speed in rising 4.2m

### Physics

What is the electric field midway between an electron and a proton separated by 0.8 nm. Don't know what formula to use. Nothing on line is helping me get to the correct answer. Appreciate anyone's help. Thanks

### physics

a particle at rest starts in horizontal strsight line with uniform acceleration ratio distance during 4th and 3rd sec ond

### physics

A 1-kg mass hangs by a string from a disk with radius 4.6 cm which has a rotational inertia of 5 × 10-5 kg·m2. After it falls a distance of 0.8 meters, how fast is it going to the nearest hundredth of a m/s?

### physics

The energy released by a heater which draws a current of 5A at 220V for 1min. E ~ V × I× t( hrs)÷1000 220×5×0.0167÷60000 Is equal to 0.00030 Kwh

### Physics

Given the masses of the sun and earth are 1.99x10^30 kg and 5.98x10^24 kg respectively. Calculate the gravitational force between them when their centers are 1.50x10^11m apart

### Physics urgent pleasw

Stone is thrown vertically downward with an inital speed of 2.0m/s from height of 10m, determine time it takes to reach the bottom. Thanks!

### physics

A 2.2kg bowling ball with a velocity of 2m/s rolls along a level floor for 30m before coming to a halt. What is the coefficient of rolling friction?

### Physics

An 84 kg child descends a slide 7.2 m high and reaches the bottom with a speed of 3.30 m/s. How much thermal energy (in joules) due to friction was generated in this process?

### physics

The speed of sound in air is 350m/sec the frequency of the fundamental node emitted by tube length 50cm open one end is:

### physics

A 63 kg child descends a slide 7.6 m high and reaches the bottom with a speed of 3.20 m/s. How much thermal energy (in joules) due to friction was generated in this process?

### physics

An object slides down a frictionless 33 degree incline whose vertical height is 37.0 cm. How fast is it going in meters/second when it reaches the bottom?

### Physics

A car is backing up at a rate of 10km/hr. If the driver looks through his rear-view mirror, how fast does a tree, which is behind him, appear to approach him?

### Physics

The block of mass 2.13615 kg has an acceler- ation of 3.7 m/s2 as shown. What is the magnitude of F? Assume the acceleration due to gravity is 9.8 m/s2 and the surface is frictionless. Answer in units of N.

### Physics

An engine of car of power 40KW moves on a rough road wit a velocity of 50ms-1.cal.the force require to bring it to rest.

### Physics

Two identical loudspeakers are 2 m apart. A person stands 4.6 m from one speaker and 3.4 m from the other. What is the lowest frequency at which destructive interference will occur at this point?

### Physics

A box is given a push up a 26.0° incline. When it reaches the bottom again it is only going 0.51 its original speed. Find the coefficient of kinetic friction.

### physics

Consider two charges, where one (+1.90 nC) is at the origin and the other (-3.61 nC) is at the position x = 4.35 cm. Find the x-coordinate where a proton would experience zero net force.

### Physics

A ball of mass 8kg falls from a height of 100m,neglecting air resistance calculate it total energy after falling a distance

### Physics

A car of mass 1000kg starting from rest and comes down an incline slope if it travel 300m in 30 second calculate i) acceleration ii) force

### Physics

A cubes weight 15N in air and 20N when totally immersed in water. Find the value of the cube of the density. Please I need the answer.

### Physics

A novice skier starts from rest and slides down a frictionless 35 degree incline whose height is 125 m. How fast will she be going at the bottom?

### Physics

write an equation that relates to frequency(f) applied to the string to the length(L) between the two fixed end points. This was from lab of standing waves.

### Physics

A flywheel turns through 60 rev as it slows from an angular speed of 2.8 rad/s to a stop. How much time is required for it to complete the first 30 of the 60 revolutions?

### modern physics

Supersonic jets are able to achieve maximum speeds of up to 3.0 × 10-6c. Calculate the percentage contraction in the length of a jet plane travelling at this speed.

### modern physics

Supersonic jets are able to achieve maximum speeds of up to 3.0 × 10-6c. Calculate the percentage contraction in the length of a jet plane travelling at this speed.

### Physics

I am not getting the difference between distance and displacement.... without using the words scalar and vector quantity, of course, i know what they mean but still i need help with this... so please help!!!

### Physics

Find the angle of elevation of a gun that fires a shell with muzzle velocity of 125m/s and hits a target on the same level but 1.55km distance

### physics

A man whose mass is 75kg walks up a stairs each 20cm high in5seconds.calculate the power expended in watts.[assume g=10m\s2

### Physics

Hello, I am wondering if someone can answer me this question: In an Atwood machine why do the tensions that handle both bodies are the same? (English is not my native language)

### Physics

A rectangular track is 40m long 30m broad.A man starts walking from one corner to another . Find the distance travelled and displacement.

### Science (physics)

A powerful motorcycle can accelerate from rest to 28 metre per second in only 4 seconds what is the average acceleration? How far does it travel in that time

### Physics

Find the work done by a white collar criminal as he pulls his 34 kg bag of booty 2.7m forward at an angle of 61 degrees with the floor. The man is pulling with a force of 19.4 N.

### physics dps

a light spiral spring is fixed at the top and a mass of 200gms is suspended from its lower end so that it has of 20cm find period of oscillations

### physics

A bucket filled with water weighing 50kg is raised from a well of depth 100m.if the linear density of the rope is 1kg per metre.then the work done is

### Physics

please help: "george drops a stone from atop a cliff of 25m. How long does it take to hit the ocean below, what velocity is it travelling when it gets there?"

### physics

Acceleration in meters per square second. A car begins at rest at a stop sign, it accelerates 25m/s over a time of 8.6sec

### Physics 1

A football is thrown upward at an 48◦ angle to the horizontal. The acceleration of gravity is 9.8 m/s^2. To throw an 80.4 m pass, what must be the initial speed of the ball? Answer in units of m/s.

### Physics

Find analytically the sum or resultant of the following displacements: A= 10m Northwest , B= 20m 30 degree north of east and C = 35m due Souh

### Physics

What is the magnitude of the electric field at a point midway between a −8.3μC and a +5.4μC charge 10cm apart? Assume no other charges are nearby.

### physics

The position of a particle moving along the x-axis is given by x = (13 + 11t − 1.5t2), where t is in seconds and x is in meters. What is the average velocity during the time interval from t = 1s to t = 4 s?

### Physics

The first leg of a relay race is semi circle of diameter 50m. If the runner covers the distance in 11s.calculate the average speedâ€

### Physics

When an objects acceleration is 0 at an instant t in time, its velocity is 1. zero at t. 2. negative at t. 3. positive at t. 4. not changing at t. My teacher never taught us this, can someone help me figure it out?

### Physics

Steve can paddle his canoe at 10 km/h in still water. If he paddles directly against a river’s current that is moving at 3 km/h, what is Sam’s velocity relative to the shoreline?

### Physics

Once a favorite playground sport, dodgeball is becoming increasingly popular among adults of all ages who want to stay in shape and who even form organized leagues. Gutball is a less popular variant of dodgeball in which players are allowed to bring their own (typically ...

### English

Hello! I will type 2 exercises from the lesson I am teaching on Wednesday-english as a foreign language - 8th graders ( it will be graded) I need you to help me with some ideas. It says: LEAD- IN: A Here is a list of some natural sciences: BIOLOGY CHEMISTRY PHYSICS BOTANY ...

### Physics

An equipotential surface that surrounds a +2.7 x 10^-7 C point charge has a radius of 0.13 m. What is the potential of this surface?

### PHYSICS

THE TYPICAL RADIO WAVE HAVE A PERIOD OF 1 US EXPRESS THIS PERIOD IN SECONDS

### physics

why are lightweight tires preferred over lightweight frams in bicycle racing?