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February 22, 2017

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
As a fish jumps vertically out of the water, assume that only two significant forces act on it: an upward force F exerted by the tail fin and the downward force due to gravity. A record Chinook salmon has a length of 1.50 m and a mass of 49.5 kg. If this fish is moving upward ...
Sunday, October 9, 2016 by Evette

Physics
Hello, I need that someone help me with this excersise. I have to calculate (USING INTEGRATION) the motion ecuation of a particle. The excersise give me the ecuation of the velocity that is v=14t-32 , the initial time t1=3 And the initial position of the particle: X1=25 My ...
Sunday, October 9, 2016 by Arthur

Physics
A spring with a spring constant of 22.0 N/cm has a block attached to one end and the other end is fixed. How much work does the spring do on the block if the spring is stretched from relaxed length by 6.8 mm as the block is moved? How much additional work is done by the spring...
Sunday, October 9, 2016 by Matt

physics
What changed Newton's original work on the movement of the Moon around the Earth into the law of universal gravitation? 1) his conclusion that the same laws applied to all objects, no matter how small 2) his connection of gravitation to his first law 3) his connection of ...
Sunday, October 9, 2016 by Betty

physics
This figure shows the force on a 0.1-kilogram mass at various distances from Earth. Notice that the force decreases as the square of the distance. Now, consider satellites A and B, both circling Earth. If A has ten times the mass of B but B is 1/10 of the distance to the ...
Sunday, October 9, 2016 by Sue

physics
An 76 kg satellite orbits a distant planet with a radius of 4500 km and a period of 280 min. From the radius and period, you calculate the satellite's acceleration to be 0.63 m/s2. What is the gravitational force on the satellite?
Sunday, October 9, 2016 by Jessica

physics (super hard)
a carnival ride is designed with seats that carry two people weighing 910.0 N each. the seats itself weights 630 N.each seat is connected to central spindle by one chain and rotates on a radios of 6.07 meters. the ride is designed to rotate fast enough that the seats swing out...
Sunday, October 9, 2016 by nick

physics
a grandfather clock is designed to have a pendulum which swings a mass at the end of the chain in a horizontal circular motion. the pendulum is designed to swing 7 degrees off of the vertical. the chain is 1.50 meters long and the maximum tension in the chain is 12.0 N. ...
Sunday, October 9, 2016 by nick

physics
an 85kg concrete block rests on a flat surface with coefficient of static friction us=0.42. find the maximum force that can pull on the block with, angle of 38 degrees above the horizontal without moving the block? please help and show work
Sunday, October 9, 2016 by nick

physics
A boater wants to head straight across a river that has a current of 3 km/hr. If the top speed of the boat in still water is 4 km/hr. 1.find the direction the boat must travel into the current to go straight across the river? 2. How fast is the boat going straight across the ...
Sunday, October 9, 2016 by cliff

physics
A wire of length 20 cm and carrying a current of 2.5 A makes an angle of 30o with a magnetic field of strength 0.8 T. Calculate the magnitude of the force on the wire. My Working: F=BILSindeta F=0.8*2.5*0.2*sin30=0.2N is this correct?
Sunday, October 9, 2016 by Neman

Physics
A bicyclist is coasting straight down a hill at a constant speed. The mass of the rider and bicycle is 80 kg and the hill is inclines at 15 degrees with respect to the horizontal. Air resistance opposes the motion of the cyclist. Later, the bicyclist climbs the same hill at ...
Sunday, October 9, 2016 by Morgan

Physics
An 8 kg bowling ball creates air resistance according to F(air)=2.14v. The bowling ball is rolled off the top of the sears tower. a) Calculate the acceleration (magnitude and direction at 1) The top of the building____ 2)when the ball reaches 5.6 m/s_____ b) What is the ...
Sunday, October 9, 2016 by Morgan

physics
determine the minimum radios of a highway curve which has banking angle of 5.74% over which vehicles will travel at 110km/h. assume that there is no friction between the road and the tires. calculate the radios?
Sunday, October 9, 2016 by nick

Physics
If two springs have their spring constants as k1 and k2 (k1>k2 . When they are stretched by same force what will be the relation between their elongations
Sunday, October 9, 2016 by Kanishka

Physics
Ade throws a ball up to a height of 10m and catches it back. What is the Displacement of the ball
Sunday, October 9, 2016 by Ufuoma

Physics
Ade throws a ball up to a height of 10m and catches it back. What is the Displacement of the ball
Sunday, October 9, 2016 by Anonymous

physics
A parachutist bails out and freely falls 59 m. Then the parachute opens, and thereafter she decelerates at 1.6 m/s2. She reaches the ground with a speed of 2.5 m/s. (a) How long is the parachutist in the air? (b) At what height does the fall begin?
Sunday, October 9, 2016 by Anonymous

physics
a 1240 kg automobile stops in a distance of 41m. if initial velocity was 22.5m/s, what force did the road exert on the car to stop it? Answer pls... Thank You
Sunday, October 9, 2016 by b

physics
A 350N box is pulled along a horizontal pathway by a rope which makes an angle of 42degrees with the pathway. If a force of 250N is applied on the rope, what is the coefficient of sliding friction?
Sunday, October 9, 2016 by b

physics
Aljhumar is trying to arrange his room. He pushes an 80kg cabinet across the wooden room which resists the motion with a 300N force of friction. What is the coefficient of sliding friction between the cabinet and the floor?
Sunday, October 9, 2016 by b

physics
The coefficient of sliding friction between a 10kg rubber tire and wet concrete road is 0.43. Determine the time in which a moving object with a velocity of 35mi/h can come to a stop on the road. What distance is covered at this time?
Sunday, October 9, 2016 by b

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?
Sunday, October 9, 2016 by b

physics
What changed Newton's original work on the movement of the Moon around the Earth into the law of universal gravitation? 1) his conclusion that the same laws applied to all objects, no matter how small 2) his connection of gravitation to his first law 3) his connection of ...
Saturday, October 8, 2016 by Jessica

physics
Two spacecraft in outer space attract each other with a force of 4 N. What would the attractive force be if they were one-eighth as far apart?
Saturday, October 8, 2016 by Jessica

physics
A coordinate system (in meters) is constructed on the surface of a pool table, and three objects are placed on the table as follows: a m1 = 1.9-kg object at the origin of the coordinate system, a m2 = 3.4-kg object at (0, 2.0), and a m3 = 4.6-kg object at (4.0, 0). Find the ...
Saturday, October 8, 2016 by Evette

physics
You are working at a garden centre for the summer. You lift a bag of fertilizer with a force of 143 N, and it moves upward with an acceleration of 0.762 m/s2. a: how much does the fertilizer back weigh?
Saturday, October 8, 2016 by dolapo

physics
What is the acceleration due to gravity at a distance of one Earth radius above the Earth's surface
Saturday, October 8, 2016 by Kathy

physics
The engine of a locomotive exerts a constant force of 6.5 105 N to accelerate a train to 90 km/h. Determine the time taken for the train of mass 1.8 107 kg to reach this speed from rest.
Saturday, October 8, 2016 by dolapo

physics
How can the LIGO gravity wave detector achieve a measurement accurate to 1/1000 of a proton's diameter
Saturday, October 8, 2016 by Gorio

physics
Objects with masses m1 = 11.0 kg and m2 = 6.0 kg are connected by a light string that passes over a friction-less pulley as in the figure below. If, when the system starts from rest, m2 falls 1.00 m in 1.48 s, determine the coefficient of kinetic friction between m1 and the ...
Saturday, October 8, 2016 by Evette

physics
A stone is tied to a string (length = 0.945 m) and whirled in a circle at the same constant speed in two different ways. First, the circle is horizontal and the string is nearly parallel to the ground. Next, the circle is vertical. In the vertical case the maximum tension in ...
Saturday, October 8, 2016 by court

physics
A stunt car driver drives off an h = 7.9 m-high cliff into a lake with a horizontal speed of 17 m/s. The car needs to clear an 17.1 m-long ledge that is 5.0 m below the edge of the cliff, as shown in the figure below. The car just misses the ledge on the way down. With what ...
Saturday, October 8, 2016 by dolapo

Physics
Two fire alarms are placed in a building, one 2.3 m north of the other. A person sitting at a desk which is 67.2 m east and 8.4 m north of the point mid-way between the alarms does not hear them when they sound. What is the lowest frequency that the alarms can be sounding at ...
Saturday, October 8, 2016 by Kilin

Physics
Commercial airplanes are sometimes towed out of the passenger loading area by a tractor. The 1800 kg tractor exerts a force of 1.75 104 N backward on the pavement, and the system experiences forces resisting motion that total 2400 N. (a) If the acceleration is 0.250 m/s2, what...
Saturday, October 8, 2016 by Laura

Physics
Two waves, identical except for phase, are traveling in the same direction through the same medium. Each of the waves has amplitude A. The amplitude of the combined (net) wave is 1.14A. What is the absolute value for the smallest possible phase difference between the two waves...
Saturday, October 8, 2016 by Ck

physics
Imagine a boat is being rowed upstream where v1 is the velocity of the boat and v2 is the velocity of the stream. What is the time required if the boat tends to cross the river along the shortest path?
Saturday, October 8, 2016 by xyz

physics
two concentric conducting spherical shells have radii R1=0.145m and R2=0.207m the inner spheres with negligible speed, Assuming that the region between the spheres is a vacuum compate the speed with which the electron stricks the outer sphere."
Saturday, October 8, 2016 by ritet

physics
A 540 kg satellite orbits at a distance from the Earth's center of about 5.4 Earth radii. What gravitational force does the Earth exert on the satellite
Saturday, October 8, 2016 by Kathy

physics
What is the acceleration due to gravity at a distance of one Earth radius above the Earth's surface
Saturday, October 8, 2016 by Katelyn

Physics
if light is incidence at a depth of 246cm, 224cm of a coin in a tank, refractive angle is 30 degree find the incidence angle
Saturday, October 8, 2016 by J. black

Physics
The density of copper is 9.8 kilograms per meter cube and the density of gold is 1.9 kilograms per meter cube. When two wires of these metals are held under the same tension, the wave speed in the gold is found to be half that in the copper wire. What is the ratio of the ...
Saturday, October 8, 2016 by Samuel

Physics
A baseball player stealing second base runs at 7.2 m/s . If he slides the last 3.8 m , slowing to a stop at the base, what's the coefficient of kinetic friction between player and ground?
Saturday, October 8, 2016 by Emma

Physics
Hospital patient. A 90.0 kg patient is suspended in a raised hospital bed as shown in the figure. The wire is attached to a brace on the patient's neck and pulls parallel to the bed, and the coefficients of kinetic and static friction between the patient and the bed are 0.500 ...
Saturday, October 8, 2016 by Emma

Physics
Find the magnitude of the force needed to accelerate a 150 g mass with a = -0.250 m/s2 i^+0.675 m/s2 j^. Find the direction of this force? Need to find F and theta.
Saturday, October 8, 2016 by Emma

Physics
An arrow is shot by stretching a bow through a distance of 0.9m by applying a force of 150N, the mass of the arrow is 1.7kg. Using the conservation of energy, calculate the speed with which the arrow leaves the bow.
Saturday, October 8, 2016 by Muomen

physics
2 masses m1 and m2 are connected at ends of in-extensible string that passes over pulley find acceleration and tension in pulley.
Saturday, October 8, 2016 by starrika

physics
Please help! The planet Mercury has a radius of about 0.38 Earth radii and a mass of only 0.055 Earth masses. Estimate g on Mercury
Saturday, October 8, 2016 by Beth

physics
What two facts did Newton need to be able to calculate the acceleration of the Moon? 1) the distance to the Moon and the diameter of the Moon. 2) the time it takes the Moon to make one revolution and the distance from the Earth to the sun. 3) the diameter of the Moon and the ...
Saturday, October 8, 2016 by Sue

physics
A 300lb car is moving at constant velocity onn a level concrete road. How much force is needed to keep it moving if the u=0.04
Saturday, October 8, 2016 by bits

physics
a 1240 kg automobile stops in a distance of 41m. if initial velocity was 22.5m/s, what force did the road exert on the car to stop it? Answer pls... Thank You
Saturday, October 8, 2016 by bits

Physics
A 12 v battery has a capacity of giving 80 amperes of current for one hour. How long can the battery keep a 60W lamp on?
Saturday, October 8, 2016 by Tamax

physics
which ball has more energy a 5 kg ball rolling at 4 m/s or a 6 kg ball rolling at 3 m/s?
Friday, October 7, 2016 by thomas

Physics
At the same distance the noise of a sandblaster is 13 dB louder than a power drill. This means the the displacement amplitude of the sound waves from the sandblaster is how many times greater than that of the power drill if both sounds have the same frequency?
Friday, October 7, 2016 by Ck

Physics
If a scooter has an acceleration of 2.5m/s^2 , how fast is the scooter going into the acceleration
Friday, October 7, 2016 by Anonymous

physics
A 3 kg weight is placed upon a spring so that it hangs downward 12 centimeters. How far would the spring stretch if a 4 kg weight were placed upon it?
Friday, October 7, 2016 by Malik Allahham

Physics (PLEASE HELP PRONTO)
A cart with a mass of 5.35 kg is placed on a frictionless ramp at an angle of 14.2. The cart is released and rolls down the ramp. Find the acceleration.
Friday, October 7, 2016 by Anon

Physics
A ball of mass m 0.285 kg swings in a vertical circular path on a string L = 0.810 m long as in the figure below. a) If its speed is 5.25 m/s at the top of the circle, what is the tension in the string there? 6.89N (is the answer) b)If the string breaks when its tension ...
Friday, October 7, 2016 by Jack

Physics
A 145-kg object and a 445-kg object are separated by 3.90 m. (a) Find the magnitude of the net gravitational force exerted by these objects on a 34.0-kg object placed midway between them. (N) (b) At what position (other than an infinitely remote one) can the 34.0-kg object be ...
Friday, October 7, 2016 by Jack

Physics
Why does the force of gravity change the speed of a satellite in an elliptical orbit? 1)The force of gravity is always tangent to the satellite motion. 2)Gravity speeds up the satellite as it moves away and slows it on its return. 3)The force of gravity is always perpendicular...
Friday, October 7, 2016 by dave

Physics
Why does the force of gravity change the speed of a satellite in an elliptical orbit? 1) The force of gravity is always tangent to the satellite motion. 2)Gravity speeds up the satellite as it moves away and slows it on its return. 3)The force of gravity is always ...
Friday, October 7, 2016 by dave

Physics
How can gravity be simulated in an orbiting space station? 1)aped like a bicycle wheel 2)Spin two pods connected by a cable 3)Rotate a cylinder to create centrifugal force as viewed by a person on the inside of the curved outer wall 4)All of the above
Friday, October 7, 2016 by dave

Physics
Which of the following is an element? H2O Hydrogen Carbon dioxide A supernova
Friday, October 7, 2016 by dave

Physics
Which two factors mainly affect ocean tides on Earth? Check two answers. Earth's revolution about both the Moon and the Sun the Moon the Sun the pull of distant planets
Friday, October 7, 2016 by dave

physics
The concept of pressure involves both force and volume. force and area. area and volume
Friday, October 7, 2016 by dave

Physics
Why does the force of gravity change the speed of a satellite in an elliptical orbit? 1)The force of gravity is always tangent to the satellite motion. 2)Gravity speeds up the satellite as it moves away and slows it on its return. 3)The force of gravity is always perpendicular...
Friday, October 7, 2016 by dave

Physics
Abody is released from a height of 20m above the ground. Find it's height above the ground when it's velocity is 10m/s
Friday, October 7, 2016 by Yawe Akram

physics
An airplane accelerates down a runway at 3.33 m/s2 for 35.3 s until is finally lifts off the ground. Determine the distance traveled before takeoff.
Friday, October 7, 2016 by Anonymous

Physics
An asteroid has a mass of 3.66 x 10^20 kg and a radius of 8.2 x 10^5 m. If a 25 kg mass is dropped fro 10 m above the "ground" of the asteroid, how long will it take the mass to fall to the ground?
Friday, October 7, 2016 by sam

physics
A semi circular rail of horizontal diameter AB=2R is placed in a vertical plane. Two particles S1 and S2 of respective masses m1 and m2 (m1 <m2) slide without friction on the inner surface of this rail. A) Particle S1 is released at point B without initial velocity ....
Friday, October 7, 2016 by vicky

physics
An 8000 kg elevator is supported by a steel cable. If the acceleration of the elevator is 1.4 m/s^2 upward, then find the tension in the cable.
Friday, October 7, 2016 by sam

Physics
two campers in a national park hike from their cabin to the same spot on a lake each taking a different path. the total distance traveled along path 1 is 7.5 km and that along path 2 is 8.2 km. what is the final displacement of each camper?
Friday, October 7, 2016 by Jay

Physics
The density of copper is 9.8×10^3 and the density of gold is1.9×10^4. When the two wires of these two metals are held under the same tension the speed in the gold wire is found to be half of that of the copper. What is the ratio of the diameters of the two wires?
Friday, October 7, 2016 by Frank

Physics
Three equal masses are suspended from a frictionless, massless pulley system, as shown. Once the system has reached equilibrium, 1) what angles will the strings make with respect to the horizontal
Friday, October 7, 2016 by Anonymous

Physics
An object with a weight of 150 N hangs from the ceiling as shown in the figure. 1) Find the tension in each string. q1 = 60 degree and q2 = 45 degree
Friday, October 7, 2016 by Anonymous

Physics
The figure shows an Atwood machine (a wheel suspended from the ceiling with two masses connected by a string) with m1 = 1.0 kg and m2 = 1.1 kg. If m2 descends a distance 3m from rest in 3.6 seconds. 1) what is the strength of the gravitational field, g, at this location (N.B. ...
Friday, October 7, 2016 by Anonymous

physics
A plane flies at 150m/s at 35 degrees east of north. It encounters a wind from the west blowing 26 m/s. What is the true course of the plane? (speed and direction)
Friday, October 7, 2016 by JD

physics
A plane flies at 150m/s at 35 degrees east of north. It encounters a wind from the west blowing 26 m/s.
Friday, October 7, 2016 by JD

Physics
If you were in an elevator what should the acceleration of the elevator be in order for you to feel what you would weigh on the martian surface(remember that acceleration is a vector, so it has both magnitude and direction)? (weight on earth=130 lbs, weight on mars=49 kg, ...
Friday, October 7, 2016 by Evette

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!
Friday, October 7, 2016 by Mike

Physics
a) Calculate the acceleration due to gravity on the planet Mars. I found this to be about 3.7 m/sec^2 b) What would your weight be on the planet Mars if you weighed 130 lbs? c) If you could jump vertically 5 ft on earth, how high would you be able to jump on mars? I'm just ...
Thursday, October 6, 2016 by Evette

Physics
Is this logic correct? Explain why momentum is conserved when a ball bounces off the ground. My logic : The ball strikes the ground with velocity v. As it leaves the ground, its velocity is also v but in the opposite direction.. i.e -v Hence, m*v + m*(-v) = 0. So, momentum is ...
Thursday, October 6, 2016 by Gary

physics
South Carolina WR Alshon Jeffery destroys the defense and makes the catch on the Hail Mary pass and dives into the endzone for the TD. (Intermediate Level) Assuming he ran at a constant velocity what is the minimum velocity Alshon would have had to run in order to make it to ...
Thursday, October 6, 2016 by joe

Physics
A cute puppy walks 20 m at 30 degrees north of east and then continues another 45 m at 15 degrees south of east. Find the magnitude of the puppy's net displacement (or the distance from the starting point)
Thursday, October 6, 2016 by Mary

optics in physics
acorridor is lighted by 4 lamps s10cm apart and suspended at a height of 5m above the centre of the floor. if each lamp gives 200cp in all directions below the horinzontal, find the illumination at the point on the floor mid-way between the second and third lamps
Thursday, October 6, 2016 by james ugbes

physics
If a vector K has component Kx = 4.1 and Ky = -13, then find the magnitude K and direction (as a positive rotation angle relative to the +x axis) of the vector.
Thursday, October 6, 2016 by Mary

physics
A constant force acts on a 5.0 kg object and reduces its velocity from 7.0 m/s to 3.0 m/s in a time of 3.0 s. Find the force.
Thursday, October 6, 2016 by Kiana

Physics
A 1.8×104 kg rocket has a rocket motor that generates 2.8×105 N of thrust. What is the rocket's initial upward acceleration? At an altitude of 5000 m the rocket's acceleration has increased to 6.3 m/s2 . What mass of fuel has it burned?
Thursday, October 6, 2016 by kitt

Physics
A loudspeaker of mass 16.0 kg is suspended a distance of h = 2.00 m below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 2.90 m What is the tension T in each of the cables? Use 9.80 m/s2 for the magnitude of the acceleration ...
Thursday, October 6, 2016 by kitt

Physics
A car starts from rest on a curve with a radius of 150 m and tangential acceleration of 1.5 m/s2 Through what angle will the car have traveled when the magnitude of its total acceleration is 3.0 m/s2 ?
Thursday, October 6, 2016 by Abby

Physics
A circular track has several concentric rings where people can run at their leisure. Phil runs on the outermost track with radius rP while Annie runs on an inner track with radius rA = 0.90 rP. The runners start side by side, along a radial line, and run at the same speed in a...
Thursday, October 6, 2016 by Abby

Physics
An object with a weight of 150 N hangs from the ceiling as shown in the figure. Find the tension in each string. q1 = 60 degree and q2 = 45 degree Please help ASAP! Type the equation and then substitute the numbers in the equation
Thursday, October 6, 2016 by Anonymous

Physics
The figure shows an Atwood machine (a wheel suspended from the ceiling with two masses connected by a string) with m1 = 1.0 kg and m2 = 1.1 kg. If m2 descends a distance 3m from rest in 3.6 seconds, what is the strength of the gravitational field, g, at this location (N.B. it'...
Thursday, October 6, 2016 by Anonymous

physics
A 65.2 kg person jumps from rest off a 3.11 m-high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 1.08 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This ...
Thursday, October 6, 2016 by taylor

physics
On a frozen pond, a 13.9 kg sled is given a kick that imparts to it an initial speed of v0 = 1.81 m/s. The coefficient of kinetic friction between sled and ice is μk = 0.122. Use the work kinetic energy theorem to find the distance the sled moves before coming to rest.
Thursday, October 6, 2016 by taylor

physics
a 5cm object is placed 50cm grom a converging mirror whose focal length is 20 cm. find the position and size of the image. Draw a ray diagram.
Thursday, October 6, 2016 by kaira

Physics/Science
I'm in 7th grade and I have a writing assignment that our teacher said "do your best" as an explanation. My best would be to call out sick the rest of the year! Hear goes. Explain the scientific accomplishments of Stephen Hawking. How dis his accomplishments affect he world? ...
Thursday, October 6, 2016 by Kyle

Physics
A glacier advances at 7 × 10−6 cm/s. How far will it move in 3.7 y? Answer in units of cm. Plz help! I don't get it.
Thursday, October 6, 2016 by Jina

College Physics
Two equal forces, 20 N each, gives you a resultant value of 20 N. What is the angle between the two forces?
Thursday, October 6, 2016 by Dayshae

physics
a particle which has zero rest mass and non zero energy and momentum must travel with a speed?
Thursday, October 6, 2016 by Samm

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