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February 27, 2017

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics- Equilibrant Force
Two movers are pushing a large crate with a force of 50.0 N each. One pushes north, the other east. What is the equilibrant force? a. 71 N Southwest b. 50 N Northeast c. 100 N Southeast d. 71 N Northeast
Monday, November 21, 2016 by MM

Physics- Equilibrium
Which of the following is in equilibrium? a. an object that was thrown straight upward at the moment it has zero velocity (my answer) b. an object moving in a circle at constant speed c. an object that moves at constant velocity d. an object that moves at constant acceleration
Monday, November 21, 2016 by MM

Physics- Accleration of a Falling Penny
A visitor to the observation deck of a skyscraper manages to drop a penny over the edge. As the penny falls faster, the force due to air resistance increases. How does this affect the acceleration of the penny? a. The acceleration decreases b. The acceleration remains constant...
Monday, November 21, 2016 by MM

Physics
Is it true that with buoyancy, the weight of the displaced water equals the weight of the complete object, even if only a part of the object is submerged? If so, why, since the weight of a larger object would be greater than that of a smaller one?
Monday, November 21, 2016 by Anonymous

Physics- Baseball thrown upwards, accleration
When a baseball is thrown straight upward, what is its acceleration at its greatest height? a. 9.8 m/s2 upward b. 9.8 m/s2 downward (my answer?) c. 0 m/s2 d. 9.8 m/s2 horizontally
Monday, November 21, 2016 by MM

Physics- Object Reaches Maximum Height
When an object that has been thrown into the air reaches its maximum height, which is true? a. its velocity is zero. b. it is at its terminal velocity. c. it is not in free fall. d. its acceleration is zero.
Monday, November 21, 2016 by MM

Physics-Tension Force
A strong, weightless rope has a 0.15 kg mass hanging from the middle of it. What tension force will make the rope horizontal, corresponding to θ=0°?
Monday, November 21, 2016 by MM

Physics
A baseball with a mass of 0.145 kg is thrown straight down at the ground. At a particular speed, it has a drag force of 0.4 N acting on it. What is its acceleration at that time? a. -7.0 m/s2 b. -2.8 m/s2 c. -9.8 m/s2 d. -12.6 m/s2
Monday, November 21, 2016 by MM

Physics
Two spherical objects have masses of 3.5 x 10^7 kg and 6.5 x 10^9 kg. Their centers are separated by a distance of 125000 m. Find the gravitational attraction between them.
Monday, November 21, 2016 by Student

Physics
The temperature of the Sun’s surface (the so-called photosphere) is about 5500 C. Assume that the Sun’s surface is pretty close to a perfect black-body emitter. (a) At what wavelength does the peak intensity of Sun’s radiation lie? (b) Estimate the total power radiated ...
Monday, November 21, 2016 by Dan

physics
A uniform rigid rod of mass 1kg and length 30cm. Find the moment of inertia of the rod about an axis perpendicular to the rod through on end.
Monday, November 21, 2016 by Kevin Land

Physics
A 51-kg vampire and 139-kg werewolf clash during the Feat of Strength part of the annual celebration of Festivus. The werewolf velocity just before the clash is 6 m/s and is directed upwards, while the vampire velocity at the moment of the collision is 10m/s and is directed ...
Monday, November 21, 2016 by Kevin Land

Physics
The electric field between two equally but oppositely charged parallel plates is 2.35 N/C [south]. If a charge of –2.00 C was placed at the midway point between the plates, what force (magnitude and direction) would act on the charge? Give the direction as acting north or ...
Monday, November 21, 2016 by Humera

physics
(1) a car travelling at a constant speed of 20ms-1 overcomes a constant frictional resistance of 300N. What is the horse power of the engine? ( take 1h.p = 3/4 kw)
Monday, November 21, 2016 by samuel

Physics
You row a boat perpendicular to the shore of a river that flows at 2.5 m/s. The velocity of your boat is 4.5 m/s relative to the water. (a) What is the velocity of your boat relative to the shore? (b) What is the component of your velocity parallel to the shore? (c) What is ...
Monday, November 21, 2016 by HELP

physics
suppose the experiment was conducted on the surface of the moon of about 1-6th that of the earth. If a single period takes exactly 1.00 second, how long does a period take on the moon ?
Monday, November 21, 2016 by Briana

Physics
A car travels at an average speed of 100k-m/hr what distance does it cover in 5min.hint speed=distance/time
Monday, November 21, 2016 by Kissless

Physics
In a vertical lifting an object with mass of 2kg is lifted 1m above the ground. A work of 80J is done with a constant force. What is the acceleration of the object?
Monday, November 21, 2016 by Anonymous

Physics
A 0.14 kg baseball is pitched at a speed of 35 m/s. If it is hit straight back at the pitcher with a force of 5400N exerted over a time interval of 1.0 millisecond, find: the distance that the baseball was in contact with the bat (hint, use d = Vave*t) Vave = 1/2(vi + vf) Vave...
Monday, November 21, 2016 by Louren

Physics
An astronaut lands on a distant planet and places a mathematical pendulum with a length of 50 cm. He measures that the pendulum makes 100 oscillations in 136 sec. What is the gravity acceleration on that planet.
Monday, November 21, 2016 by Anonymous

Physics
Water drops from a waterfall 84 meters high .The temperature of the water at the bottom is found to be 26.2 degrees Celsius. Calculate its temperature at the top of the waterfall
Monday, November 21, 2016 by Leslie

Physics
A 1200 lb sleigh is pulled along a horizontal surface at uniform speed by means of a rope that makes an angle of 30 degrees above the horizontal. If the tension in the rope is 100 lb., what is the coefficient of friction?
Monday, November 21, 2016 by Lian

very hard PHYSICS QUESTION
Consider a solid ball of mass m = 50g and is placed on a long flat slope that makes an angle of 30° to the horizontal. The ball was initially at rest and was then released such that it rolled down the slope without slipping. With a detailed explanation of your method ...
Monday, November 21, 2016 by Matthew

Physics
in air, an object weights 15N. when immersed in water, it weights 12N. when immersed in another liquid, its weights 13N. determine the density of the object, the relative density of the object and the density of the other liquid?
Monday, November 21, 2016 by Joehannah

Physics
A wheel rotating initially at an angular velocity of 1.0 rad/s, accelerates over a 10 S interval at a rate of 0.1 rad/s^2. What angular displacement does the wheel undergo in this 10 S interval, in terms of revolutions?
Monday, November 21, 2016 by Joey

Physics
A bullet traveling at 200 m/s strikes a soft wood and penetrates 4.5 cm through it before coming to rest. Calculate the bullet's average retardation
Monday, November 21, 2016 by Kaniel

Physics
A 1 kg mass attached to a 1 m string is rolled around in a horizontal circular path with an angular velocity of 100 RPM what is the tension of the string? Please show how you got your answer.
Monday, November 21, 2016 by Joey

Physics
Three boxes are lined up so that they are touching each other as shown in the figure below. Box A has a mass of 30.0 kg, box B has a mass of 45.0 kg, and box C has a mass of 75.0 kg. An external force (F) pushes on box A toward the right, and the force that box B exerts on box...
Sunday, November 20, 2016 by Josh

physics
A solar collector is placed in direct sunlight where it absorbs energy at the rate of 780 J/s for each square meter of its surface. The emissivity of the solar collector is e = 0.76. What equilibrium temperature does the collector reach? Assume that the only energy loss is due...
Sunday, November 20, 2016 by Anonymous

physics
A ball is projected with initial velocity 50m\s at an angle of elevation of 37°from the top of a cliff 55m high. calculate the total time the ball is in the air and the maximum horizontal distance covered...please I have solved this question but didn't get the answer ..I need...
Sunday, November 20, 2016 by mercy

physics
A skate boarder traveling at a constant speed of 22 m/s on a road comes to a straight incline with a constant slope (do not use g for incline). While going up the incline, the skater has constant deceleration. If she is 16m up the incline after 12.0 s A) what is the ...
Sunday, November 20, 2016 by bob

Physics
A car is proceeding at a speed of 12.0 m/s when it collides with a stationary car in front. During the collision, the fist car moves a distance of 0.300 m as it comes to a stop. The driver is wearing her seat belt, so she remains in her seat during the collision. The driver’...
Sunday, November 20, 2016 by Josh

physics
What is the period (in seconds) of a simple pendulum 62.0 cm. long, on the earth?
Sunday, November 20, 2016 by kassy

Physics
A block that has a mass of 0.0190 kg and a block that has a mass of 2.00 kg are attached to the ends of a rope. A student holds the 2.00-kg block and lets the 0.0190-kg block hang below it; then he lets go. Air resistance can be neglected. 1)What is the tension in the rope ...
Sunday, November 20, 2016 by Ryan

physics
A pendulum makes 27 vibrations in 36 s. What is its period in seconds?
Sunday, November 20, 2016 by kassy

physics
A fisherman's scale stretches 2.3 cm. when a 2.1 kg. fish hangs from it. What will be the frequency of vibration if the fish is pulled down and released so that it vibrates up and down?
Sunday, November 20, 2016 by kassy

Physics
A 35.1 g pinball starts at the top of a frictionless pinball table inclined at 46.0°. If the ball is released and the spring at the bottom is compressed 0.0600 m and has a spring constant of k = 27.7 N/m, how far back up the pinball table will the pinball travel before ...
Sunday, November 20, 2016 by Physics Lover

physics
When a 85.0 kg. person climbs into an 1800 kg. car, the car's springs compress vertically 1.8 cm. What will be the frequency of vibration when the car hits a bump? (Ignore damping.)
Sunday, November 20, 2016 by kassy

Physics
An angle of a circle with a 2 m radius is delta theta = 20 degree. What is the corresponding arc length delta s?
Sunday, November 20, 2016 by Mary

Physics
The block of mass 3.43553 kg has an acceleration of 2.1 m/s^2 as shown. / / F a _____________ <-/ )23 degree <---- |_3.43553kg_| What is the magnitude of F? Assume the acceleration due to gravity is 9.8 m/s^2 and the surface is frictionless. Answer in units of N
Sunday, November 20, 2016 by Jules

physics
A water is operated by solar power. If the solar collector has an area of 5.25m2, and the intensity delivered by sunlight is 475W/m2, how long does it take to increase the temperature of .600m3 of water from 20.C to 85.0C?
Sunday, November 20, 2016 by Amie J.

physics
Two moles of an ideal gas have a volume of 3.43X10-3m3. the initial temperature of the gas is 78.0C. If the pressure is held constant while it is heated to a final temetatue of 275C, what would be the final volume?
Sunday, November 20, 2016 by Amie J.

physics
A .524kg object is tied down to the bottom of a container which container an unknown fluid. the tension in the rope is 38.5N. the object displaces .00735m3 of unknown fluid. Find the density of the unknown fluid.
Sunday, November 20, 2016 by Amie J.

Physics
A wheel is rotating with angular velocity 14 rev/s. What angular acceleration would be needed to bring the wheel to rest in a single rotation?
Sunday, November 20, 2016 by Mary

physics
Two forces are exerted on a hockey puck which initially stopped on frictionless ice. Force 1 is exerted in the positive x direction with magnitude of 10 N and Force 2 is exerted in the positive Y direction with magnitude 4 N. The hockey puck has a mass of 0.5 kg. What is the ...
Sunday, November 20, 2016 by Sue

Physics
0 degree centigrade temperature cause 300m/s2 how many centigrade temperature cause 400 m/s2 velocity
Sunday, November 20, 2016 by Ghost

Physics
An electric heater supplied at 40 Volt's draws a current of 5 ampere. If it is now connected to a 120 Volt supply, find the value of current being drawn ?
Sunday, November 20, 2016 by Kartik

Physics
A nichrome wire of diameter 5mm and length 5m has resistivity of 10^-4 ohm meter. If wire is compressed to double it's diameter. Find the resistance in its new form. Also find the resistance of the wire originally ?
Sunday, November 20, 2016 by Kartik

physics
A uniform rod of 1 meter is bent at its midpoint to make90.The distance from its centre of mass
Sunday, November 20, 2016 by girija

physics
If your car goes from 0 mi/h to 70 mi/h in 8 s, what is your average acceleration? Answer in units of miles/(hours x seconds ).
Saturday, November 19, 2016 by Zoe

physics
One day while moving boxes you get tired and decide to use a rocket instead. You attach a small rocket of negligible mass to a 6.45 kg box. When you turn the rocket on, it provides a constant thrust of 212 N, and the sbox begins sliding across the pavement. If the magnitude of...
Saturday, November 19, 2016 by Fb

physics
A uniform plank AB which is 75m long and has a weight of 350N and is supported horizontally by two vertical ropes A and B. A weight of 100N rest on the plank at C where AC=4m. Find the tension in each rope A and B
Saturday, November 19, 2016 by atiyya

physics
A girl uses a spanner of length 20cm to tighten a nut. If she pulls at right angles to the end of the spanner with a force of 50N,calculate the moment of her pull
Saturday, November 19, 2016 by atiyya

Physics
A 3.20 kg block starts at rest and slides a distance d down a frictionless 30.0° incline, where it runs into a spring (Fig. 8-6). The block slides an additional 23.0 cm before it is brought to rest momentarily by compressing the spring, whose spring constant k is 443 N/m. Fig...
Saturday, November 19, 2016 by Alex

Physics
You demonstrate hitting a board in a karate class. The speed of your hand as it hits the thick board is 12 m/s with respect to the board, and the mass of your hand is about 0.74 kg. How deep does your hand go into the board before stopping if the collision lasts for 2.0×10−3s?
Saturday, November 19, 2016 by Bob

Physics
What role does the mass of the projectile play in changing the horizontal and vertical motions of the projectile? Why? Thank you!
Saturday, November 19, 2016 by Louren

Physics
A car with its passengers have a total mass of 4200kg .the car is travelling along a horizontal road when it moves ,it experiences a forward driving force of magnitude F newtons and a constant resistance force(opposite to driving force)of 850N a)what is the value of F if the ...
Saturday, November 19, 2016 by Ali

Physics
A beam of partially polarized light can be considered to be a mixture of polarized and unpolarized light. Suppose a beam of partially polarized light is sent through a polarizing filter. The polarization direction of the filter can be changed by rotating it. As the filter is ...
Friday, November 18, 2016 by Po

Physics
A wheel accelerates from rest to 59 rad/s at a rate of 58 rad/s^2 What is the angular displacement of the wheel??? A) 24 rad B) 38 rad C) 30 rad
Friday, November 18, 2016 by Katelyn

Physics
A 3500kg truck moving at 45km/h collided head on with a 1600kg car moving at 25km/h. Find the velocity of the combined cars after the collision.
Friday, November 18, 2016 by Sumeet

Physics
A pipe is open at both ends. The pipe has resonant frequencies of 655 Hz and 786 Hz (among others). Find the two lowest possible values for the length of the pipe. Use c = 343 m/s for the speed of sound. __ m __ m?
Friday, November 18, 2016 by Jackson

physics
A 6.95 kg bowling ball is dropped 2.20 m onto a large spring. If the bowling ball compresses the spring by 0.55 m, what must the spring constant of the spring be?
Friday, November 18, 2016 by Cristiano

physics
A spring gun shoots out a plastic ball at speed v0. If the ball's speed is increased by a factor of 2, what distance must the spring have been compressed?
Friday, November 18, 2016 by Kevin

Physics
Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States ...
Friday, November 18, 2016 by BrookeNeed

Physics
An object is sliding along a flat surface with an initial speed of 30 m/s. What must the coefficient of kinetic friction be between the object and the surface if the object slides to a stop in 10m? What would be the speed of the object after it had only slide half that distance?
Friday, November 18, 2016 by Kay

physics
A mass of 8kg is whirled round in a vertical circle using a rope of length 80cm if it makes 2.5 cycles in 1 second, calculate the maximum tension the rope experiences
Friday, November 18, 2016 by dyna

Physics
A 52 kg woman is standing in a 26 kg cart that is moving a velocity of 1.2 m/s S. The woman staying rest then moves at a velocity of 1m/s (E) what is the final velocity of the cart? I just ugh, don't even know how to even start answering the question as this deals with ...
Friday, November 18, 2016 by Anna

physics
A steel spring is hung vertically. Using a ruler, the lower end of the spring was measured to be 25.0cm from its upper end. However, when an object of mass 0.500kg it attached to the lower end of the spring the spring stretches to a new length of 45.0cm. With the aid of a ...
Friday, November 18, 2016 by Jack

PHYSICS
Consider a solid ball of mass m = 50g and is placed on a long flat slope that makes an angle of 30° to the horizontal. The ball was initially at rest and was then released such that it rolled down the slope without slipping. With a detailed explanation of your method ...
Friday, November 18, 2016 by Liam

Physics
An empty SG bottle weights 25 g.When filled with water completely it weights 55 g and with alcohol it weights 48 g. Find the RD of alcohol A numerical
Friday, November 18, 2016 by .

Physics
An empty SG bottle weights 25 g.When filled with water completely it weights 55 g and with alcohol it weights 48 g. Find the RD of alcohol A numerical
Friday, November 18, 2016 by Anonymous

Physics
An empty SG bottle weights 25 g.When filled with water completely it weights 55 g and with alcohol it weights 48 g. Find the RD of alcohol A numerical
Friday, November 18, 2016 by Anonymous

Physics
An empty SG bottle weights 25 g.When filled with water completely it weights 55 g and with alcohol it weights 48 g. Find the RD of alcohol A numerical
Friday, November 18, 2016 by Anonymous

physics
a bullet of mass 0.05 kg strikes a wooden block of mass 5 kg and becomes embedded within the block. The block and bullet then fly off at 10 m/s after the collision. What was the original velocity of the bullet if the block was initially at rest?
Thursday, November 17, 2016 by kaylee

Physics
The active element of a certain laser is an ordinary glass rod 19.5 cm long and 1.04 cm in diameter. If the temperature of the rod increases by 77.3°C, calculate its increase in length.Calculate its increase in volume. Calculate its increase in diameter. (Use 9.0×10-6 °C-1 ...
Thursday, November 17, 2016 by Ashley

physics
A plane landing on a small tropical island has just 50 m of runway on which to stop. If its initial speed is 47 m/s, what is the maximum acceleration of the plane during landing, assuming it to be constant? Answer in units of m/s 2 .
Thursday, November 17, 2016 by mahnoor

Physics
Dana has set up a target for her toy spring gun. The gun requires 5.50 g pellets as ammunition that travel 11.4 m/s when shot. If the spring inside has maximum compression of 0.0700 m, what is the spring constant for the spring in the toy gun?
Thursday, November 17, 2016 by Hard Question

physics
A 3.35g lead bullet at 31.0°C is fired at a speed of 255 m/s into a large block of ice at 0°C, in which it embeds itself. What quantity of ice melts?
Thursday, November 17, 2016 by taylor

physics
An automobile accelerates from rest at 0.9 m/s 2 for 25 s. The speed is then held constant for 18 s, after which there is an acceleration of −5.8 m/s 2 until the automobile stops. What total distance was traveled? Answer in units of km
Thursday, November 17, 2016 by ken

Physics
A 40 kg child start from rest and travels 4 m down a slide that is inclined 35 degree to the horizontal. If her speed at the bottom is 2.5 m/s , what was the frictional force along the slide?
Thursday, November 17, 2016 by Ali

physics
Consider a solid ball of mass m = 50g and is placed on a long flat slope that makes an angle of 30° to the horizontal. The ball was initially at rest and was then released such that it rolled down the slope without slipping. With a detailed explanation of your method ...
Thursday, November 17, 2016 by Liam

physics
A steel spring is hung vertically. Using a ruler, the lower end of the spring was measured to be 25.0cm from its upper end. However, when an object of mass 0.500kg it attached to the lower end of the spring the spring stretches to a new length of 45.0cm. With the aid of a ...
Thursday, November 17, 2016 by Jack

Physics
What is simple harmonic motion or SHM?
Thursday, November 17, 2016 by Ousman

Physics
An object is projected from a satellite orbiting 200 km above the surface of the earth. The object has a speed relative to the Earth of 2.85×104 m/s. What is its speed when it is very far from the earth?
Thursday, November 17, 2016 by James

Grade 11 Physics
Harry, who has a mass of 54 kg, has just gotten a flybar pogo stick and is standing on top of a small wall. He pushes off the wall with a velocity of 1.7 m/s, gets on the stick and lands. The stick has a spring constant of 3.5 x 104 N/m and he compresses it by 20.0 cm when he ...
Thursday, November 17, 2016 by Michelle

Physics
You are lawn bowling and bowl a ball with a speed of 5.00 m/s. Unfortunately, your ball hits a large rock of mass 400 g, resulting in a perfectly elastic collision. If the final velocity of the ball after the collision is -2.93 m/s, what must the mass of the ball be
Wednesday, November 16, 2016 by Physics Lover

Physics
A 21700 kg train is reaching the end of the line. In order to slow down, the front of the train snags a cable that is attached to a spring. If the spring has a spring constant of 73400 N/m and the train's initial speed is 53.0 m/s, how much will the spring stretch to stop the ...
Wednesday, November 16, 2016 by Physics Lover

Physics
A meter stick whose mass is 0.200 kg is supported at the zero cm mark by a knife edge and a force F at the 100 cm point. A mass of 700 grams is attached to the stick at 40 cm mark. Find the magnitude of N and F in Newton's.
Wednesday, November 16, 2016 by Lauren

Physics
You throw a 238 g baseball straight up from a height of 1.73 m and it reaches a height of 13.2 m. Using conservation of energy, what minimum initial speed is needed to accomplish this?
Wednesday, November 16, 2016 by Physics Lover

physics
A 2.0 g bullet is shot with an initial velocity of 200.0 m/s into a board (I = 12.0 kg m2). The board is held still by a frictionless pivot a third away from its bottom end, as shown below. Assume that you can treat the board as a uniform rod. 1. What is the initial angular ...
Wednesday, November 16, 2016 by anna

Physics
A 4.0 g bullet is shot with an initial velocity of 300.0 m/s into a board (I = 19.0 kg m2). The board is held still by a frictionless pivot a third away from its bottom end, as shown below. Assume that you can treat the board as a uniform rod. 1) What is the initial angular ...
Wednesday, November 16, 2016 by Sara S

Grade 11 Physics
Megan and Catrina are at a playground swing set. Catrina pulls Megan back so that the 2.5 m long chain makes a 35 angle with the vertical. She pushes her with a speed of 6.5 m/s and Megan begins to swing forward. a) What is Megan’s fastest speed? b) How fast is Megan ...
Wednesday, November 16, 2016 by Alexis

applied physics
An object is thrown vertically up ward from the ground with initial velocity 1960cm/s Neglecting air resistance, find the maximum height reached and the total time taken to return to the straight point ,/using first order differential equations/
Wednesday, November 16, 2016 by Ermiyas Abas

Physics
a 30.0 g particle is released from rest at x = 5 J. What is the speed of the particle at x = 0 J?
Wednesday, November 16, 2016 by Speed Ratio

Physics
What is the speed ratio (vA/vB) if particle A has 6 times the kinetic energy and half the mass of particle B? 3.46 1.73 2.45 0.289
Wednesday, November 16, 2016 by Speed Ratio

Physics
One end of a spring is attached to a wall and Jamie pulls on the other end of the spring with a force of 200 N, stretching the spring by 11.5 cm. If Jason takes the end of the spring off of the wall and they both pull the spring with a force of 200 N, how far will the spring ...
Wednesday, November 16, 2016 by Physics Lover

physics
The figure shows an overhead view of a 3.00-kg plastic rod of length 1.20 m on a table. One end of the rod is attached to the table, and the rod is free to pivot about this point without friction. A disk of mass 37.0 g slides toward the opposite end of the rod with an initial ...
Wednesday, November 16, 2016 by Amy

Physics
compute for the power while pushing an object by a 200N force making 18 degrees above the horizontal covering a distance of 7.5m in 0.5 minute?
Wednesday, November 16, 2016 by Anonymous

Physics
Francesca dangles her watch from a thin piece of string while the jetliner she is in accelerates for takeoff, which takes about 11 s . Tap image to zoom . Part A Estimate the takeoff speed of the aircraft if the string makes an angle of 25∘ with respect to the vertical.
Wednesday, November 16, 2016 by Destani

Physics
Air conditioners sold in the United States are given a seasonal energy-efficiency ratio (SEER) rating that consumers can use to compare different models. A SEER rating is the ratio of heat pumped to energy input, similar to a COP but using English units, so a higher SEER ...
Wednesday, November 16, 2016 by Morgyn

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