# physics please HELP !

74,760 results, page 55-
## Physics

A car initially moving at 15 m/s accelerates at 4.5 m/s2 over a distance of 10 m. Find the final velocity? -
## Physics

what is your power output if you climb a 2m ladder in 10 seconds? suppose your height is 565N. -
## Physics

On a dt graph if there is a curve from 1 decreasing to 1.2 in an interval does is the velocity and acceleration + or 9? And is it slowing down or speeding up or neither? -
## physics

A wheel has turned through 120 revs in 10 s after starting. find the angular acceleration. -
## Physics

How fast must a plane fly at a latitude of 41.9° so that the sun stands still relative to the passengers? -
## Health Physics

The human body is 20-25 percent efficient. In what form is energy lost? -
## physics

Bob jumps into a pool, after he stops moving and becomes stationary i the water. What happens to his k energy? -
## Physics

If the period of the moon were 31 days while its orbit radius 3.8x10^8m, what would the mass of the Earth be? -
## physics

Why is parallax method not useful for measuring the distances of stars more than 100 light years away? -
## Physics

Why are the armature and field windings of an electric motor usually wound on an iron core? -
## physics

a pendulum swing with a speed of 1.5 m/s at its lowest point. How high will it rise before it stops -
## physics

The three vectors in the figure below have magnitudes a = 2.45 m, b = 3.15 m, and c = 15.0 m and angle θ = 36.5° find x component of vector a -
## physics

determine the thrust produced if 1.5 x 10^3 kg of gas exits the combustion chamber each second, with a speed of 4.00 x 10^3 m/s -
## Physics

Another pendulum swings to and fro at a regular rate of two times per second. Show that its period is 0.5 s. -
## physics

how much energy is stored in a pinball machine spring (constant=750N/m) that is compressed 3 cm? -
## physics

describe with the aid of a fully labelled diagram the features and their uses of a bicycle pump -
## physics

What is the acceleration experienced by the tip of the 1.5 cm long sweep second hand on your wrist watch -
## Physics

A bike starts from rest and accelerates to 20 m/s over a period of 6 seconds. What is the acceleration of the car? -
## Physics

what is the mass of the toy truck if the force of friction holding it in place is 18.5N u= 0.2 at 30 degrees -
## Physics HELP ME PLEASE

A 1250 kg car increases it's speed from 11 m/s to 27 m/s in 5.4 s. - What is the cars acceleration? - How much force is required? -
## physics

a stone is thrown upward with a speed of 24.0m/s how fast is it moving when it reaches a height of 13.0m? -
## Physics

A 1.15 kg block slides down a 19.0 m long 29.0° incline at constant velocity. How much work is done by friction? -
## physics

The three vectors in the figure below have magnitudes a = 2.45 m, b = 3.15 m, and c = 15.0 m and angle θ = 36.5° find the x and y component of vector a -
## physics

What is the frequency of the microwaves in a microwave oven? The wavelength is 12 cm. I have to give the answer in GHz -
## Physics

What is power output of a 60 kg person who walks up a 4 meter flight of stairs in 4.0 seconds? -
## Physics

A 0.50 kg hammer is taken on a space mission. What is its weight on a planet where the acceleration due to gravity is 3.8 m/s2? 0.50 kg 1.9 kg 0.50 N 1.9 N -
## physics

Can an adult male be rescued from a fall by tying a rope to a car's axle? -
## physics

A child slides down a hill on a toboggan with an acceleration if 1.5 m/s2^2. If she starts at rest, how far has she traveled in (a) 1.0s,(b) 2.0s, and (c) 3.0s? -
## physics

What is the kinetic energy of a car of mass 1900 kg moving at a constant speed of 21 m/s -
## physics

Find the gravitational force of attraction between two balls each weighing 10 kg,when placed at a distance of 1 meter apart -
## physics

how many energy is transferred when 8.9g of liquid hydrogen changes to gas -253 degree celsius -
## physics

What force is needed to accelerate a child on a sled with the total mass of 43kg at 1.5m/s -
## Physics

What is the mass of water that has its temperature raised from 27°C to 32°C when it is heated by 5.0 x 106 J of heat energy? -
## Physics

List at least two major potential asvantages of power production by fusion rather than by fission. -
## physics

An object accelerates uniformly from rest at a rate of 2 m/s2 for 3 s and then 5 m/s2 for 15 s. Find its final velocity? -
## Active physics

How much hear must be added to 1.5kg of water at -25degC to raise it up to 119degC? -
## physics

a body travels 200 cm in the first two second and 220 cm in the next 4 seconds.what will be the velocity at the seventh second from the start. -
## physics

A speedboat increases in speed from 21 m/s to 30.9 m/s in a distance 191 m. Find the magnitude of its acceleration. -
## Physics

If the third harmonic of a standing wave in a vibrating string is 600 Hz, what is the fundamental frequency? -
## Physics

A constant 5 N horizontal force hits a stationary 2 kg ball. What is the balls speed after going 10 m? -
## Physics

What acceleration would a 35 KG box have if we pushed it with a force of 275 N across a surface that has a coefficient of friction of .7? -
## Physics

If you are 2.0 s from being directly under a window that is 11 m above the sidewalk your standing on, and someone throws a water ballon will you get hit? -
## Physics

A ball travels 200cm in the first 2sec and 220cmin the next 5sec. Find the velocity at 7s -
## physics

If a man weighs 820N on d earth what would be on Jupiter, where the acceleration due to gravity is 25.9m/s -
## Physics

What distance does Anna covered by running on a circular track of length 500m? -
## Physics

Air in a balloon does 50 J of work while absorbing 70 J of heat.What is its change in internal energy? -
## Physics

If the cosmic microwave background radiation (CMBR) is at a temperature of 2.7K, what is its peak wavelength? -
## Physics

A fuel has heat of combustion equal to 30 kJ / g. How much energy is released when 5 kilograms are oxidized? -
## Physics

What is the difference in blood pressure between the head and feet of a person of height 171 cm? -
## physics

The speed of a train increased from 15 mi/hr to 25 mi/hr in a distance of 500 ft. Calculate the average acceleration in ft/s2. -
## physics

A hockey puck has no friction on it. It has a mass of 0.28 kg and experiences a force of 48 newtons. What is its acceleration? -
## Physics

The speed of a train increased from 20 mi/hr to 30 mi/hr in a distance of 500 ft. Calculate the average acceleration in ft/s2 -
## physics

Wrap a cotton wool around a thermometre,will its temperature rise? Explain your answer please -
## Physics

Time taken by an object falling from rest to cover the heights of h1and h2 are respectively t1 and t2.then the ratios of t1 and t2 is -
## physics

How high must a 2.0-kg basketball be thrown so that the top of its arc, it has a potential energy of 160 J? -
## physics

8. Before you drop a ball held at a height of 5m with a weight of 20 N, what is its gravitational potential energy -
## Physics

Determine the acceleration of an electron placed in a constant downward electric field of 4.0X10^5N/C. -
## physics

calculate the speed of an 7.3*10^4kg airliner with a kinetic energy of 1.4*10^9J. answer in units of m/s. -
## Physics

A projectile is shot straight up from the earth's surface at a speed of 1.20×104 km/hr. How high does it go? -
## physics

The density of a solid ball with a mass of 231 g and a volume of 110 cm^3 is ____ g/cm^3. -
## Physics

A nurse counts 76 heartbeats in one minute. What are the period and frequency of the heart's oscillations? -
## physics

If the density of a medium is 1000 kg/m3 and the propagation speed is 1540 m/s, the impedance is rayls. -
## Physics

Find speed of sound in air if distance is 170 meters and time is 1.1 second -
## physics

A tuning fork produces a wave at 280 Hz and with a wavelength of 1.5 m. Calculate its velocity. -
## Physics

How would I find final velocity at the top of an inclined ramp with a given angle theta? -
## Physics

what is the distance that a satellite must be from Earths surface if it's period of rotation is 1 day? I really not sure where to even start.. -
## physics

Three balls A, B, and C, with masses of 3 kg, 1 kg, and 1 kg, respectively, are connected by massless rods. What are the coordinates of the center of mass? -
## physics

a ball moves with a constant speed of 4 m/s around a circle of radius 0.25 m. what is the period of the motion? -
## physics

Good job "Drwls", your answer to my bowling ball question worked. Way to go! -
## physics

a ball is thrown vertically upward at a speed of 45 m/s. how long does it take to return to the ground? -
## physics

how much torque do you exert if you push perpendicularly on a door with a force of 30 N at a distance of 0.85 m from its hinges -
## physics

How much energy becomes unavailable for work in an isothermal process at 440 K, if the entropy increase is 25 J/K -
## physics

what force must the woman in Figure 3.38 exert on the floor with her hands in order to do a pushup? -
## physics

Find the density of a substance whose mass is 28 grams and whose volume is 4 cubic centimeters -
## Physics

The parabolic TV antenna receives electromagnetic waves from satellites. What is special about these rays? -
## physics

you drop a penny off the roof and it htis the water 4.2 seconds later, what is the height of the bridge? -
## Physics

calculate the magnitude of the resultant of a pair of 100-km/h velocity vectors that are at right angles to each other. Please help me! thanks! -
## physics

It takes 2.75s for the rock to hit the water at 54.45mph, how high is the bridge? -
## Physics

Can someone explain why electrons cannot exist in orbitals and why we need to describe their location in terms of probabilities. -
## Physics

A dog is running at 3.0 m/s for 3.6 km. How long did it take him to arrive at his destination? (Give answer in seconds) -
## physics

how to calcula distance of a object in free fall if only the time it reaches the ground is given -
## physics

If a protonand an electron are released when they 2.0X10^-10m apart, find the initial accelerationof each of them. I know a=ke^2/mr^2 k = 8.99 x 10^9 e = 1.6 x 10^-19 r = 2.0x 10^-10 so what is the m ???? -
## physics

Is it possible for a frictional force to increase the mechanical energy of a system? If so, give examples. -
## physics

What is the magnitude of the electrostatic force on a +5 C harge 1.75 m to the left of a -2.5 C Charge? (show your work) -
## Physics

From the standpoint of energy and power, what are the advantages for a car with high horsepower? What are the disadvantages? -
## applied physics

if a DC motor uses a775 coulombs of charge in 15 seconds,how much current is produced -
## Physics

Calculate the average speed of the car in km/h, it can accelerate from 96.56 km/hr in 4.3 seconds. Distance is not provided -
## Physics

What is the age in years of a bone in which the ratio 14C/ 12C is measured to be 2.3×10^−13? -
## Physics

Will a cyclist coast farther if the lamp connected to his generator is turned off? Explain. -
## Physics

What is the age in years of a bone in which the ratio 14C/ 12C is measured to be 2.3×10^−13? -
## Physics check

In 1906, J. J. Thomson won the Nobel Prize for the discovery of the ..... electron? -
## PHYSICS

At what height above Earth's surface is the gravitational acceleration reduced from its sea-level value by 0.40%? -
## physics

find the acceleration of a 3 kg mass as it moves with a constant speed of 4 m/s along a circle of radius 2 m. -
## physics

How long is a rocket in the air if it is shot at an angle of 55¢ª with an initial velocity of 25 m/s and traveled for 88 m -
## Physics

8. Fire engines used to be red. Yellow-green is now the preferred color. Why the change? -
## Physics

If I dropped a bowling ball from the empyre state building, at what velocity would it descend? -
## physics

When the experimental set up is immerse in water of refractive index n=1.5.what will be the charge in beta? -
## physics

A car traveling at +7.2 m/s accelerates at the rate of 0.65 m/s 2 for an interval of 2.4 s. Find vf . Answer in units of m/s -
## physics

what is the potential energy of 4 point charges each of value Q at the corners of a square of side length a. -
## Physics 30

If a truck moving at 30km/hr accelerates at 2.5m/s^2 to 50 km/hr, what time (in sec) does it take? a. 2.22s b. 5.56s c. 8 s d. 28.8s