# Homework Help: Science: Physics

## Recent Homework Questions About Physics

Physics
The passengers in a roller coaster car feel 1.60 times heavier than their true weight as the car goes through a dip with a 24.0 m radius of curvature. What is the car's speed at the bottom of the dip? Which equation do I use? V= 2(pi)r/t = 2(pi)rtf = wr

physics
A stone is dropped from a 100m bridge. How long does it take the rock to reach the ground?

physics
In these figures, we see a boy named Billy riding a carnival ride called the Rotor and the free-body diagram for the forces acting on him. What must be the magnitudes of the vectors (f)wall,Billy and (W)Earth,Billy if Billy remains at the same height along the wall? 1) The ...

Physics
A 300kg bobsled starts down an icy slope inclined at 12 degrees. There is some friction between the bobsled and the slope. If the hill is 200m long, how long does it take for the sled to reach the bottom?

Physics
A 300kg bobsled starts down an icy slope inclined at 12 degrees. There is some friction between the bobsled and the slope. Write the equations of motion in the two directions where the x axis is along the hillside.

physics-sir damon help
An paris aeroplane left Benin airport at 1:00pm to fly to Yola airport 600km away on a bearing of 110• at an airspeed of 220km/hr. On that particular day, the meteorologists reported that there existed a steady wind of 35km/hr from a bearing of 40•. What is the course of ...

Physics
A car heads due west on Interstate 80 going 63.0 km/hr for 2.1 hours. The car then turns and heads exactly northwest on Interstate 42 going 53 km/hr for 3.3 hours. What is the resultant displacement of the car? I've done some work on it and I have a good idea. I found the ...

Physics
a ball is shot upwards from ground level at a vertical speed of 40 m/s. a. What is the vertical speed of the ball just as it hits the ground? Explain. b. How long is the ball in the air? Explain. c. Draw a height vs time graph of the situation. Include a point at each 1-second...

physics
What happens to centripetal force when speed decreases, in the special case that the object continues moving in a circle of the same radius? A) The radius cannot stay the same. B) The force also decreases. C) The force increases. D) Speed does not affect centripetal force. E) ...

Physics 12
A 62 kg rock climber is attached to the rope that is allowing him to hang horizontally with his feet against the wall. The tension in the rope is 7.1x10^2 N,and the rope makes an angle of 32 degrees with the horizontal.Dtermine the force exerted by the wall on the climber's feet.

physics
A basketball rolls to the right with a velocity of 4 meters per second. It is pushed up and accelerated up for 2 seconds with an acceleration of 4 meters per second . Then for 1 second it is pushed and accelerated down with an acceleration of 12 meters per second . What is its...

Physics
A car passes the starting line traveling 20.5 mph. It accelerates constantly at 7.96 mi/hr-s. After 7.67 seconds, how far has the car travelled? Be sure to give your answer in miles with the correct number of significant digits. The answer should be in the scientific notation ...

Physics
Describe the steps necessary to convert a parabolic decreasing curve to a liner graph. That's is one with the relationship between two variables give a straight line.

Physics
A 5 kg magnet exerts a constant force of 3 N on a 0.25 kg magnet. 1) What force will the smaller magnet exert on the larger magnet? Please show step by step including the right equations for this problem

Physics
What net force F will accelerate a 0.5 kg mass at 4 m/s2? If this same net force were applied to a 20 kg mass, what would its acceleration be? Please show me step by step including the right equations

AP physics
According to the equation a=bc what type of relationship (direct or inverse) exerts between the quantities A and C? Draw a qualitive graph to describe the relation between A and C. Assumeing B is constante.

Physics
Two blocks, each of mass m = 3.35 kg are hung from the ceiling of an elevator as in the figure below. (a) If the elevator moves with an upward acceleration a with arrow of magnitude 1.7 m/s2, find the tensions T1 and T2 in the upper and lower strings. T1 = N T2 = N (b) If the ...

Physics
An object of mass m1 = 4.10 kg placed on a frictionless, horizontal table is connected to a string that passes over a pulley and then is fastened to a hanging object of mass m2 = 6.70 kg as shown in the figure -> Find the magnitude of the acceleration of the objects. (m/s2...

Physics
A block slides down a frictionless plane having an inclination of θ = 13.2°. The block starts from rest at the top, and the length of the incline is 1.70 m. -> Find the acceleration of the block. (m/s2 down the incline) -> Find its speed when it reaches the bottom ...

Physics
An electron of mass 9.11 10-31 kg has an initial speed of 2.60 105 m/s. It travels in a straight line, and its speed increases to 6.00 105 m/s in a distance of 4.40 cm. Assume its acceleration is constant. (a) Determine the magnitude of the force exerted on the electron. ...N...

Physics
Maya follows a maze by going: 3 m north, 2 m west, 1 m south, 1 m west, 2 m north, 6 m east, and 2 m north. What is her final displacement in a north/south direction.

Physics
I don't need somone to fully answer this questions, but I need help as to where to get started. Occasionally a severe leg break requires traction to help the bones heal properly. While in traction, the leg is held stationary in the air and is under tension by a series of wires...

Physics
Determine the relative density of a regular shaped object

Physics
When an object is moving in a circle, but it is not held to the center by a tangible connection like a string, what provides the centripetal force? 1) some force such as friction or gravity. 2) the tendency for the object to move in a straight line. 3) centrifugal force. 4) ...

Physics
A car heads due west on Interstate 80 going 63.0 km/hr for 2.1 hours. The car then turns and heads exactly northwest on Interstate 42 going 53 km/hr for 3.3 hours. What is the resultant displacement of the car?

physics: mechanics and heat
Two strings support a small 8kg body. find the tension in the strings if they both make 30° with the vertical.

physics: mechanics and heat
The following three forces act on a particle: 30N at 30° with the x- axis, 50 N at 135° with the x-axis, and 20N along the negative x-axis. Find the fourth force on the particle which will keep it in equilibrium. Draw it's free-body diagram.

Physics
Two trains approach each other at a railroad crossing. Train 1 travels 80 km/h and Train 2 travels 50 km/h. They both sound their horns before passing each other, emitting sound waves at 300 Hz. The speed of sound is 343 m/s. At what frequencies does a person waiting at the ...

physics
top-bottom whole drag of 5m ice,density0.9kg\cc.by a rope mug of water bring from whole.rope length?

Physics
A book of 10 newton is placed on the table. The force exerted by the surface of the table on the book will be?

physics
When an object is moving in a circle, but it is not held to the center by a tangible connection like a string, what provides the centripetal force? 1) some force such as friction or gravity. 2) the tendency for the object to move in a straight line. 3) centrifugal force. 4) ...

Physics
A long, heavy rope hangs straight down from a high balcony on an apartment building. The lower end of the rope hangs about 1.0 m above the ground. If you grab onto the lower end and waggle it back and forth with constant frequency f, a wave travels up the rope. What would ...

Physics
What happens to centripetal force when speed decreases, in the special case that the object continues moving in a circle of the same radius? A) The radius cannot stay the same. B) The force also decreases. C) The force increases. D) Speed does not affect centripetal force. E) ...

Physics
Why does "banking" or (tilting) a turning road create centripetal force? A) Because banking the corner keeps car from going too fast. B) Because the angle of the roadway creates a centripetal force. C) Because the angle of the roadway helps cars counteract friction. D) Because...

physics
A high-speed drill rotating ccw at 2300 rpm comes to a halt in 2.9 s .

Physics
A ball is raised to a height of 30.0m above the ground. What would its velocity be when it has fallen to a height of 15.0m above the ground. (You must solve this as a conservation of energy problem, and can do it in one step!) Any help would be appreciated..

Physics
Pool players often pride themselves on their ability to impart a large speed to a pool ball. In the sport of billiards, event organizers often remove one of the rails on a pool table to allow players to measure the speed of their break shots (the opening shot of a game in ...

Physics
A soldier is tasked with measuring the muzzle velocity of a new rifle. Knowing the principles of projectile motion, he decides to perform a simple experiment at the indoor firing range. The soldier hangs a target a distance of d = 104 m from the end of the barrel. The rifle is...

Physics
A wave on a string is described by: y=(3.6cm)sin(2.7x−3.1t +0.97) where x is in meters, and t is in seconds, phase constant is in radians Consider a particle at x= 0.50m. After t = 0, how much time will pass before that particle first reaches its maximum transverse speed...

Physics
Entrance and exit ramps for freeways are often circular stretches of road. As you go around one at a constant speed you will experience a constant execrations. Suppose you drive through an entrance ramp at a modest acceleration 3.0 m/s^2. What will the acceleration be if you ...

Physics
A 24.5-kg child is 11.6 m from an 85.5-kg adult. Where is the center of mass of this system? Take the origin at the position of the child.

Physics
When an item has been launched into orbit, what happens? 1: It continues to fall but its path never reaches the ground. 2: Centripetal force from Earth's gravity keeps it from being accelerated toward Earth. 3: It no longer falls because the weakness of Earth's gravity with ...

Physics
An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic waves that travel 1530 m/s in seawater. How deep is the water directly below the vessel if the time delay of the echo to the ocean floor and back is 7 s? Answer in units of m. plz help and explain

Physics
Please help..... When something is thrown over a large distance (on earth ) what new factor comes into play? 1- The decrease in gravity over long distance 2- The increase in gravity over long distance 3- The tendency of thrown objects to fall to the ground 4- The difference ...

Physics
Two ants race across a table 76 cm long. One travels at 5.2 cm/s and the other at 2 cm/s. When the first one crosses the finish line, how far behind is the second one? Answer in units of cm. Can you teach me how to do this plz?

Physics
A vector changes if 1. its direction changes. 2. Any of these 3. its magnitude changes. 4. its direction and magnitude both change. 5. None of these i know it is not 3 or 4. Please explain it to me

Physics
A 51kg person on a merry-go-round is traveling in a circle with a radius of 2 m at a speed of 6 m/s A) What acceleration does the person experience? B) What is the net horizontal force? C) How does it compare with the person's weight?

Physics
The motion of a wave traveling along a stretched string is described by the equation: y(x,t)=(2.4cm)sin(5.7x−14.0t) What is the minimum time it takes for a particle on the string to move from y= -2.4 cm to y = 2.4 cm? Can someone help me give some hints on how to do the ...

Physics
A biker traveling at 6m/s accelerates for 3 seconds at a rate of 3.4m/s2. How far did the biker travel while accelerating?

physics
The propeller of a plane rotate clockwise at 26900 rpm. What is the angular acceleration (in rad/s2) of the propeller if it takes 8.00 s to come to a standstill?

Physics
ool players often pride themselves on their ability to impart a large speed to a pool ball. In the sport of billiards, event organizers often remove one of the rails on a pool table to allow players to measure the speed of their break shots (the opening shot of a game in which...

Physics
A net force is applied to an object, the same net force is then applied to a second object with 6.2 times the mass of the first then the acceleration of the second object will be how many times the acceleration of the first object?

Physics
If a 350 kg object is moving with constant velocity 22 m/s due east then what is the magnitude of the net force acting on the object?

Gyroscopes/Physics
Which of the following best describes the motion of a working gyroscope moving through space? a. the gyroscope both translates and rotates b. the gyroscope rotates, abut does not translate c. the gyroscope neither translates nor rotates d. the gyroscopes translates, but does ...

Physics
A skateboarder starts up a 1.0-m-high, 30∘ ramp at a speed of 7.2 m/s . The skateboard wheels roll without friction. At the top, she leaves the ramp and sails through the air. How far from the end of the ramp does the skateboarder touch down? Express your answer with the...

Physics
A bicycle and rider travel along a road. Which of the following statements is true? a. Only the rider undergoes a translation. b. Only the bicycle undergoes translation. c. Neither the bicycle nor the rider undergoes a translation. D. The bicycle and rider undergo translation

Physics
A container of mass 0.3 kg slides along the ice with a speed of 4 m/s when it reaches a rough section where the coefficient of kinetic friction is 0.8. How long will it take the puck to stop sliding?

physics
Earth of mass 6×10^24 kg is in motion around the sun with a linear velocity of magnitude 30 km/s. a) Determine the magnitude of the linear momentum of the center of mass of Earth. b) Is this linear momentum conseved?

Physics
A rocket is fired vertically with an acceleration of 16m/s^2. After time T, the rocket's engine runs out of fuel and it begins to fall freely. The maximum height of the rocket is 940m, what is the minimum value of T?

Physics
Two blocks are connected over a massless, frictionless pulley. The mass of block 2 is 8.00 kg, and the coefficient of kinetic friction between block 2 and the incline is 0.250. The angle θ of the incline is 28.0°. Block 2 slides down the incline at constant speed. What ...

Physics
A 1200 kg car rounds a curve of radius 71 m banked at an angle of 11°. What is the magnitude of the friction force required for the car to travel at 82 km/h? My physics optional extra work: This would be helpful so I can compare the solutions here as I do the work by myself.

Physics
A 0.79 kg ball is connected by means of two ideal strings to a vertical, rotating rod. The strings are tied to the rod and are taut. The upper string is 29.0 cm long and has a tension of 29.7 N, and it makes an angle θ2 = 64.0° with the rod, while the lower string makes ...

Physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. (a) Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed of a person situated at the equator. (b) What ...

Physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. (a) Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed of a person situated at the equator. My ...

Physics
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.70 × 104 m/s, and the radius of the orbit is 5.80 × 106 m. A second satellite also has a circular orbit around this same planet. The orbit of this second satellite has a radius of 8....

Physics
Tarzan plans to cross a gorge by swinging in an arc from a hanging vine (see Fig). If his arms are capable of exerting a force of 1200 N on the rope, what is the maximum speed he can tolerate at the lowest point of his swing? His mass is 84 kg and the vine is 4.8 m long. My ...

Physics
Speedboat (A) negotiates a curve whose radius is 115 m. Speedboat (B) negotiates a curve whose radius is 240 m. Each boat experiences the same centripetal acceleration. What is the ratio vA/vB of the speeds of the boats? My physics optional extra work: This would be helpful so...

Physics
A hockey puck of mass m = 70 g is attached to a string that passes through a hole in the center of a table, as shown in the figure below. The hockey puck moves in a circle of radius r = 1.20 m. Tied to the other end of the string, and hanging vertically beneath the table, is a...

Physics
My physics optional extra work: This would be helpful so I can compare the solutions here as I do the work by myself. Question: A car enters a circular flat curve with a radius of curvature of 0.20 km with a maximum speed of 135 km/h. If the friction between the road and the ...

Physics
A mop is pushed across the floor with a force F of 36.0 N at an angle of Θ = 50.0° (see figure below). The mass of the mop head is 3.75 kg. Calculate the acceleration of the mop head if the coefficient of kinetic friction between the head and the floor is μk= 0.400...

Physics
Depth of water is 1000m.Density of water is 1000kg/m3.Calculate atmospheric pressure

Physics
A hockey puck that has a mass of 170 g is tied to a light string and spun in a circle of radius 1.35 m (on frictionless ice). The string breaks under a tension that exceeds 5.00 N. What is the maximum speed of the puck without breaking the string? (Express your answer to three...

physics
A cube of edge 2cm and mass 10g is placed on the surface of a table. What is the pressure exerted by the cube on the table.

Physics
If 20 J of work is done in compressing a spring from 0 cm to 6 cm, then find the work done in compressing the same from 3 cm to 6 cm. My solution If 0.5kx^2= 20, & newx=0.5x, Should the work done be (0.5kx^2)/4=5 joules ? Pls explain. Thanks.

Physics
Consider the Bohr energy expression (Equation 30.13) as it applies to singly ionized helium He+ (Z = 2) and an ionized atom with Z=4 and only a single electron orbiting the nucleus. This expression predicts equal electron energies for these two species for certain values of ...

Physics
A hydrogen atom is in the ground state. It absorbs energy and makes a transition to the n = 5 excited state. The atom returns to the ground state by emitting two photons, one in dropping to n = 4 state, and one in further dropping to the ground state. What are the photon ...

Physics
Determine the ratio of the relativistic kinetic energy to the nonrelativistic kinetic energy (1/2mv2) when a particle has a speed of (a) 2.60 × 10-3c. and (b) 0.972c

Physics
A carnot refrigerator uses an ideal carnot cycle to cool its interior. The outside air has a temp of 304K and the refrigerator is kept at a temp of 279K. 1) what is the coefficient of performance of this refrigerator? 2) if the refrigerator does 1500J of work on the working ...

Physics- displacement, velocity, etc.
25. Maria is standing at the edge of a cliff that is 10 m high over a canyon. She throws a rock upward off the side of the cliff. Right before the rock reaches the canyon floor, it has a speed of 25 m/s. a) What was the rock’s total displacement? 10 meters b) What was the ...

Physics
A carnot refrigerator uses an ideal carnot cycle to cool its interior. The outside air has a temp of 304K and the refrigerator is kept at a temp of 279K. 1) what is the coefficient of performance of this refrigerator? 2) if the refrigerator does 1500J of work on the working ...

Physics- Acceleration
A car starts at rest and accelerates at a constant rate for 12 seconds to a speed of 30 m/s. a) What is the acceleration? b) What is the total distance traveled in these 12 seconds?

Physics
A wind turbine rotates at 8.40 rpm and has an angular acceleration of 0.0326 rad/s2. If the wind turbine takes 27.0 s to come to a complete stop, how many revolutions will this take?

Physics
A quarter on a spinning vinyl record has a centripetal acceleration of 31.8 m/s2. What is the acceleration of the quarter if it is placed twice as far from the centre of the vinyl record?

Physics
A neutron star has 12 km radius and rotation period 1.6 s. What's the centripetal acceleration on its surface at the equator?

Physics
A 96.4-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.86 m/s2, (b) moving upward at a constant speed

Physics
A woman stands on a scale in a moving elevator. Her mass is 65.0 kg, and the combined mass of the elevator and scale is an additional 757 kg. Starting from rest, the elevator accelerates upward. During the acceleration, the hoisting cable applies a force of 9550 N. What does ...

AP Physics 1
You exert a force of a known magnitude F on a grocery cart of total mass m. The force you exert on the cart points at an angle θ below the horizontal. If the cart starts at rest, determine an expression for the speed of the cart after it travels a distance d. Ignore ...

A stone is dropped from rest from a bridge that is 45 m above a river. A second stone is thrown down 1.o s after the first stone is dropped. The two stones strike the water simultaneously. What was the initial velocity of the second stone?

physics
The drawing (not to scale) shows one alignment of the sun, earth, and moon. The gravitational force that the sun exerts on the moon is perpendicular to the force that the earth exerts on the moon. The masses are: mass of sun=1.99 × 1030 kg, mass of earth=5.98 × 1024 kg, mass...

Physics- Velocity, Displacement, etc.
A child boards a bus for summer camp. His mom is waiting next to the bus. The bus begins moving 3 m/s east with respect to the ground. The child is walking 0.5 m/s west towards the back of the bus with respect to the bus. The mother begins running 1 m/s east with respect to ...

Physics
A river has a current of 4 m/s south with respect to the shore. A swimmer is swimming in the river (which is redundant). a. If the swimmer is swimming 2 m/s north with respect to the water, what is his velocity relative to the shore? b. If the swimmer is swimming 3 m/s south ...

Physics
An object is thrown at 30 m/s and at a 40 degree angle. What is the range of the object, given that the ground is horizontal and flat? I'm not sure whether to use (vi^2sin2x)/g or x = Vh*t.

Physics
A uniform rod of weight 5N and length 1m is pivoted at the 20cm mark from one end. A weight is hung from the other end so that the rod balances horizontally. What is the value of the weight?

Physics
a block of mass 10kg is kept on ground. a vertically upward force F=(20t)N starts acting at t=0. the height of the block from the ground at t=10s is

Physics
A lamp of mass 5kg is hung from two hooks 2.5cm apart on the horizontal ceiling of room by strings of length 1.5m and 2m.Find tension in the strings?

physics
A 300g lead is heated to 95celsius and is then dropped into 100g of water at 10celsius. If the final temperature is 15celsius. What is the specific heat of the lead?

physics
A 500g copper at 100celsius is placed in a 200g water at 25celsius which is contained in an aluminum calorimeter that has a mass of 400g. If the final temperature of the whole system is 30celsius, find the specific heat of the lead.

Physics
A cheetah can run approximately 100 km/hr and a gazelle at 80.0 km/hr. If both animals are running at full speed, with the gazelle 70.0 m ahead, how long before the cheetah catches its prey?

physics
A horse is running across a field. The horse accelerates at 8.00 m/s2 over a distance of 9.70 m. It runs until its speed is 23.4 m/s and continues at this speed. What was the horse's initial speed?

physics
A baseball player standing on the ground throws a ball straight up. The ball leaves the player's hand with a speed of 6.22 m/s and is in the air for 2.70 s before hitting the ground. How high above the ground was the baseball player's hand when he released the ball?

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