# Homework Help: Science: Physics

## Recent Homework Questions About Physics

physics
Explain in detail how you would find the density of an unknown high-density object if you had only the objects listed below.If you show calculations, make sure you define your variables.Assume all containers are large enough to hold the object.... You have: 1. - A spring scale...

physics
Mrs. Johnson's kid is trying to drink with a straw that runs through an airtight cork in the top of a bottle of water. Please explain to her kid why he won't get any water.

Physics
While driving in the rain at 30 m/s you notice that the raindrops appear to be going straight down. After dropping your little sister off at daycare you turn around and drive the opposite direction at the same speed. However now you notice that the rain is making an angle of ...

Physics
You are on a tight budget so you’ve let your tires get more worn than they should and now their radius is 15 mm less than they were originally. Is your odometer over-estimating or under-estimating the distance you drive?

Physics
While at the county fair you take a ride on the carousel and notice that it goes around once in 12 s. The radius of the carousel is 15 m. As the ride comes to an end, it slows down smoothly, coming to a stop in 2.5 revolutions. What is the magnitude of the rotational ...

Physics
The amplitude of a spring oscillator decreases by 50% after 1 period. What is tgr amplitude after 3 oscillations? What is the time constant assuming that one period is 2seconds?

Physics
A circus cat has been trained to leap off a 12-m-high platform and land on a pillow. The cat leaps off at v0 = 3.6 m/s and an angle θ = 37°

physics
What is the ground velocity of an airplane if its air velocity is 800 km/h [E] and the wind velocity is 60 km/h [42 E of N]?

Physics
Explain in detail how you would find the density of an unknown high-density object if you had only the objects listed below.If you show calculations, make sure you define your variables.Assume all containers are large enough to hold the object.... You have: 1. - A spring scale...

Physics
You want to carry an 800kg object into the air using a helium balloon. What size of a helium balloon (I'm looking for volume) would be required to accomplish such a task? Assume the density of air is 1.25 kg/m3 and the density of helium is 0.18 kg/m3.

Physics
You drill a well to a depth of 100-m. Find the difference in water pressure, comparing the top and bottom of the well

physics
A hippo has a mass of 6000kg. When standing on 4 feet, how much pressure is exerted on the ground? Assume each foot has an area of 0.10 square meter. Show your work.

physics
A hippo has a mass of 6000kg. When standing on 4 feet, how much pressure is exerted on the ground? Assume each foot has an area of 0.10 square meter. Show your work.

physics
Mrs. Johnson's kid is trying to drink with a straw that runs through an airtight cork in the top of a bottle of water. Please explain to her kid why he won't get any water.

physics
A hippo has a mass of 6000kg. When standing on 4 feet, how much pressure is exerted on the ground? Assume each foot has an area of 0.10 square meter. Show your work.

physics
A ferry-boat is 4 m long and 6 m wide, and floats in fresh water. A 400kg horse is loaded onto the ferry. How much deeper will the ferry float when it is loaded with the horse? Show ALL of your work. Include units in your solution.

physics
Three cubic meters of liquid nitrogen has a mass about 2700 kg. When this much liquid nitrogen evaporates into gaseous air of density 1.25 kg/m3, what will its volume be? Show your work

PHYSICS
IP A tennis player moves back and forth along the baseline while waiting for her opponent to serve, producing the position-versus-time graph shown in the figure(Figure 1) .Without performing a calculation, indicate on which of the segments of the graph, A, B, or C, the player ...

Physics
A man pulls a box with a force of 70N along the positive y-axis,while a boy pulls it with a force of 50N,making an angle of 80 degrees counter clock-wise with the positive y-axis. (i)In what direction should a second boy apply a force of 60N so that the box move along the ...

physics
A particle has an acceleration of +6.24 m/s2 for 0.440 s. At the end of this time the particle's velocity is +9.36 m/s. What was the particle's initial velocity?

PHYSICS
You are driving through town at 14 m/s when suddenly a car backs out of a driveway in front of you. You apply the brakes and begin decelerating at 3.3 m/s2. PART B)How much time does it take to stop?After braking half the time found in part A, is your speed 7.0 m/s, greater ...

PHYSICS
In heavy rush-hour traffic you drive in a straight line at 12 m/s for 1.5 minutes, then you have to stop for 3.5 minutes, and finally you drive at 15 m/s for another 2.5 minutesPlot a position-versus-time graph for this motion. Your plot should extend from t=0 to t=7.5 minutes...

PHYSICS
Blood flows through a major artery at 1.3 m/s for 0.40 s, then at 0.70 m/s for another 0.40 s through a smaller artery. Is the average speed of the blood 1.0 m/s, greater than 1.0 m/s, or less than 1.0 m/s ?Verify your answer to Part A by calculating the average speed.

physics
You are driving through town at 14 m/s when suddenly a car backs out of a driveway in front of you. You apply the brakes and begin decelerating at 3.3 m/s2.How much time does it take to stop? After braking half the time found in part A, is your speed 7.0 m/s, greater than 7.0 ...

Physics
A bird flies from the South Pole to the North Pole. Part of the journey is 1000 miles that takes 2 weeks. What is the bird’s velocity in that time? Show work for credit and include final units.

Physics
When Reggie stepped up to the plate and hit a 0.150-kg fast ball traveling at 36.0 m/s, the impact caused the ball to leave his bat with a velocity of 45.0 m/s in the opposite direction. a. If the impact lasted for 0.002 s, what force did Reggie exert on the baseball? b. ...

Physics
A stone with mass 0.8kg is attached to one end of a string 0.9m long . The string will break if its tension exceeds 600N. The stone is whirled in a horizontal circle ,the other end of the string remains fixed. Find the maximum speed , the stone can attain without breaking the ...

Physics
What is the displacement of 45° SE 13 km and 20° NE 14 km?? (With Solution)

Science
Physics A scientific instrument weighing 98 pounds on the Earth is transported to another planet whose mass is 1.7 Earth masses and whose radius is 0.7 Earth radii. What does this instrument weigh on this planet? To be graded correctly, enter the new weight in pounds (numbers ...

physics
Trying to escape his pursuers, a secret agent skis off a slope inclined at 30° below the horizontal at 60 km/h. To survive and land on the snow 100 m below, he must clear a gorge 60 m wide. Does he make it? Ignore air resistance.

physics
Calculate the rotational inertia of a wheel that has a kinetic energy of 24,400 J when rotating at 677 rev/min. I know that I = mr^2 and that T = Ia; also I calculated 677rpm to be 70.9 radians/sec. But I don't understand how to integrate KE into this.

physics
How much time will it take a car travelling at 88 km/hr (55 mi/hr) to travel 500km? Show work for credit and include final units.

Physics
PART 1 Raft made of 2.2m long pine logs with Average diameter of logs 26cm.How many logs are needed to strap together to build raft to hold max 4 people? Density of log = 600 kg/m^3 Each people weights 512N PART 2 What percent of the logs is under water when you are on your ...

Physics
Name any Margins of error that would happen in the lab "Which path requires the most energy? (gas)

physics
An object is released from rest and falls in free fall motion. The speed v of the object after it has fallen a distance y is given by v2 = 2gy. In an experiment, v and y are measured and the measured values are used to calculate g. If the percent uncertainty in the measured ...

physics
The energy source used to produce most of the electrical energy in the United States

physics
A small dog is trained to jump straight up a distance of 1.2 m. How much kinetic energy does the 7.2-kg dog need to jump this high? (The acceleration due to gravity is 9.8 m/s2.) Show your work for credit.

Physics
Huck Finn walks at a speed of 0.60 m/s across his raft (that is, he walks perpendicular to the raft’s motion relative to the shore). The raft is traveling down the Mississippi River at a speed of 2.20 m/s relative to the river bank. What is Huck’s velocity (speed and ...

Physics
A projectile is shot from the edge of a cliff 145m above ground level with an initial speed of 65.0 m/s at an angle of 37.0° with the horizontal. How far did the shot go horizontally?

Physics
Your gun is perfectly level with a monkey at a distance of 55 m. Your bullet is shot perfectly horizontal at a speed of v_0=38 m⁄s at the exact moment the monkey lets go of the branch. How far does the monkey fall before the bullet hits it?

Physics
During your trip in question 10, you encounter some construction. In 25 seconds, you have to slow from 70 mph to 55 mph. What is your acceleration in mph/s?

Physics
After today’s test, you are going to meet some friends at Disney World. The total distance to Disney World is 68 miles. If you make it there in 72 minutes, what is your average velocity in miles per hour?

Physics
Assume you have a canon aimed straight up. The cannonball is shot at a velocity of v_0=69 m/s. How high does the cannonball go? How much time does it take the cannonball to reach that height?

Science
Pls help me solve this question pls. A stone of mass 6.5kg is thrown vertically upward with velocity with 10m/s find a. the potential energy at the greatest height and the value of h .b the kinetic energy of reaching the ground again(g=10m/s2) in physics?

physics
A ball is thrown horizontally from a window 27 m above the ground. The ball strikes the ground at a point 80 m from the base of the building. The acceleration due to gravity is 9.8 m/s2. What is the resultant velocity of the ball just before it strikes the ground? 37.76 m/s 25...

physics
blood is pumped from the heart at a rate of 5.0l/min into the aorta (radius 1.0cm)determinethethe speed of the blood

Physics
Raft made of 2.2m long pine logs.Average diameter of logs 26cm.How many logs are needed to strap together to build raft to hold max 4 ?What percent of the logs is under water when you are on your raft in the water with your friend?

Physics
Raft made of 2.2m long pine logs.Average diameter of logs 26cm.How many logs are needed to strap together to build raft to hold max 4 people? What percent of the logs is under water when you are on your raft in the water with your friend?

physics
The distance between two successive crests of a certain transverse wave is 1.13 m. 20 crests pass a given point along the direction of travel every 18.6 s. Calculate the wave speed. Answer in units of m/s. So far I have gotten 1.22 for my answer by 20/18.6 x 1.13. I also tried...

physics ap
we'l find the time, t, for the ball to fall from the tabletop to the floor. use the equation Δy=viΔt+at^2/2. Take the vi to be zero and a to be 9.81 ±.02 m/s^2. you must first solve this equation for t. Δy=.922m what am i suppose to do with the acceleration because it has ...

Physics
A police car stopped at a set of lights has a speeder pass it at 100 km/h. If the police car can accelerate at 3.6 m/s^2, how long does it take to catch the speeder?

Physics
A hollow sphere has a uniform volume charge density of 4.61 nC/m3. The inner radius is a = 14.6 cm and the outer radius is b = 43.8 cm. What is the magnitude of the electric field at 21.9 cm from the center of the sphere? What is the magnitude of the electric field at 140. cm ...

PHYSICS
A window washer pulls herself upward using the bucket-pulley apparatus.. Part A) How hard must she pull downward to raise herself slowly at constant speed? The mass of the person plus the bucket is 80 kg . Part B) If she increases this force by 16 %, what will her acceleration...

physics
The cable supporting a 2150-kg elevator has a maximum strength of 2.2×104 N . What maximum upward acceleration can it give the elevator without breaking?

Physics
phobos, a moon of mars has maas of 1.08 x 10^16 kg, and an average radius of 1.35x10^4 m. calculate the gravitational field strength at the surface of phobos

physics
The drawing shows two blocks that are placed at the ends of a massless board. The board is balanced on a support that serves as an axis of rotation. The block on the left has a mass of 5.8 kg. What is the moment of inertia of this system about the axis of rotation?

physics
The drawing shows three objects rotating about a vertical axis. The mass of each object is given in terms of m0, and its perpendicular distance from the axis is specified in terms of r0. Rank the three objects according to their moments of inertia, largest to smallest.

physics
A hiker, who weighs 811 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 3350 N, and rests on two concrete supports, one on each end. He stops 1/6 of the way along the bridge. What is the magnitude of the force that a ...

Physics
A hollow sphere has a uniform volume charge density of 4.61 nC/m3. The inner radius is a = 14.6 cm and the outer radius is b = 43.8 cm. What is the magnitude of the electric field at 21.9 cm from the center of the sphere? What is the magnitude of the electric field at 140. cm ...

Physics
Which is the best example of Newton's Third Law of Motion? A hockey puck sliding on the ice will keep going until it is hit by another player or hits the wall. It takes more force to move a large tractor trailer than it does to move a small sports car. A swimmer who jumps off ...

Physics
A charge of uniform linear density 2.89 nC/m is distributed along a long, thin, nonconducting rod. The rod is coaxial with a long conducting cylindrical shell with an inner radius of 6.23 cm and an outer radius of 15.5 cm. If the net charge on the shell is zero, what is the ...

Physics
There is a block of mass 1 on a frictionless surface attached to a string. The string goes over a frictionless pulley. The pulley is a hoop with a rotational inertia of I=MR^2. The other end of the string is attached to a hanging block of mass 2. The hanging block is then ...

Physics
An electron starts from rest travels a distance of 15 cm with constant acceleration and hits a television screen at a speed of 3×10^6 m/s .Calculate the acceleration of the electron.

Physics
What's is the change in the barometer I'd it is carried to the moon

physics
A glass cylinder with A diameter 12 cm has initial water level at 120 cm. When a ball I totally immersed in it,the water level rises to 135 cm. What is the volume of the ball immersed?

physics
A glass cylinder with a diameter 12 cm has initial water level at 120 cm. When a ball is totally immersed in it,the water level rises to 135 cm. What is the volume of the ball immersed?

Physics
A sample of CO2 occupies a volume of 3.50l at 125 kPa pressure,What pressure would the gas exert if the volume was decreased to 2.00l?

physics
The flywheel of a steam engine runs with a constant angular speed of 350 rev/min. When steam is shut off, the friction of the bearings stops the wheel in 1.0 h. A) At the instant the flywheel is turning at 75 rev/min, what is the tangential component of the linear acceleration...

so, (3.75)(4) + (.5)(3.75)(49) or 106.875 radians that's not the correct answer, so is it just the second part to find the additional angle? (.5)(3.75)(49) = 91.875 but it too is incorrect, what am I missing?

physics
Starting from rest, a disk rotates about its central axis with constant angular acceleration. In 4.0 s, it has rotated 30 rad. Assuming that the acceleration does not change, through what additional angle will the disk turn during the next 7.0 s? I calculated the acceleration ...

Physics
A record turntable rotating at 33 1/3 rev/min slows down and stops in 36s after the motor is turned off. (a) Find its (constant) angular acceleration in revolutions per minute-squared. (b) How many revolutions does it make in this time? ------------------------------ I tried ...

Physics
Santa loses his footing and slides down a frictionless,snowy roof that is tilted at an angle of 27.0. If Santa slides 9.00 m before reaching the edge,what is his speed as he leaves the roof?

Physics
A thin copper plate of diameter 11.0 cm is charged to 9.00 nC. What is the strength of the electric field 0.1 mm above the center of the top surface plate?

physics
What is the quantity of thermal energy needed to 0,10kg convert ice at -10 degree Celsius into steam at 100 degree Celsius

Statistics (elementary probability theory)
In an examination 60 candidates offer maths, 80 offer english,and 50 offer physics, if 20 offer maths & english, 15 offer english & physics, 25 offer math & physics and 10 offer all the 3. How many students entered to the examination ?

physics
The surface shown is a square and has a side length of 14.0 cm. The electric field acting on this area has a magnitude of 180. N/C at an angle of 27.5°. Calculate the electric flux through the shown surface.

Physics
There is a rectangle of length 1.40 cm and width 6.10 cm in the xy-plane. If the electric field can be expressed by (100.[^(i)] +234 [^(k)]) N/C, what is the flux through the rectangle?

Physics
An object is placed 20.0 cm from a thin converging lens along the axis of the lens. If a real image forms behind the lens at a distance of 8.00 cm from the lens, what is the focal length of the lens?

physics
what is gravitational field of the earth?

physics
with what velocity must a body be thrown from earth surface so that it may reach a height 4Re the earth surface. given Re=6400km g=9.8m/s

Physics
The liquid in the open tube manometer is mercury, y1=3cm and y2 = 7cm. Atmospheric pressure is 980mbrs. (A) what is the absolute pressure at the bottom of the U-shape tube? (B) what is the absolute pressure in the open tube at a depth of 4 cm below the free surface? (C) what ...

Physics
A cylinder of fixed capacity44.8liters contains helium gas at standered temperature and pressure. What is tge amount of heat needed to raise the temperature of the gas in the cylinder by 15°C

The figure below shows two points in an E-field: Point 1 is at (X1,Y1) = (3,4) in m, and Point 2 is at (X2,Y2) = (12,9) in m. The Electric Field is constant, with a magnitude of 68 V/m, and is directed parallel to the +X-axis. The potential at point 2 is 588 V. Calculate the ...

Physics
Could you please check these? The work of which scientist(s) helped to explain light's ability to propagate through a vacuum? ++A. Maxwell B. Davisson and Germer C. Fresnel, Fraunhofer, and Arago D. Newton An object that has a height of 0.4 meter is placed at a distance of 0.7...

Physics
The value of the electric field at a distance of 86.9 m from a point charge is 74.9 N/C and is directed radially in toward the charge. What is the charge? The Coulomb constant is 8.98755 × 109 N · m2 /C 2 . Answer in units of C.

Physics
A particle with charge −5 µC is located on the x-axis at the point −4 cm , and a second particle with charge −6 µC is placed on the x-axis at 4 cm. What is the magnitude of the total electrostatic force on a third particle with charge 8 µC placed on the x-axis at 2 cm...

physics
The figure shows a jet engine suspended beneath the wing of an airplane. The weight of the engine is 12600 N and acts as shown in the figure. In flight the engine produces a thrust of 69100 N that is parallel to the ground. The rotational axis in the figure is perpendicular to...

physics
The drawing illustrates an overhead view of a door and its axis of rotation. The axis is perpendicular to the screen. There are four forces acting on the door, and they have the same magnitude. Rank the torque τ that each force produces, largest to smallest.

Physics
Small, slowly moving spherical particles experience a drag force given by Stokes' law: Fd = 6πηrv where r is the radius of the particle, v is its speed, and η is the coefficient of viscosity of the fluid medium. (a) Estimate the terminal speed of a spherical pollution ...

physics
An auto race takes place on a circular track. A car completes one lap in a time of 22.8 s, with an average tangential speed of 37.3 m/s. Find (a) the average angular speed and (b) the radius of the track.

physics
The earth spins on its axis once a day and orbits the sun once a year (365 1/4 days). Determine the average angular velocity (in rad/s) of the earth as it (a) spins on its axis and (b) orbits the sun. In each case, take the positive direction for the angular displacement to be...

physics
The table that follows lists four pairs of initial and final angles of a wheel on a moving car. The elapsed time for each pair of angles is 1.5 s. For each of the four pairs, determine the average angular velocity (magnitude and direction as given by the algebraic sign of your...

physics
A pitcher throws a curveball that reaches the catcher in 0.65 s. The ball curves because it is spinning at an average angular velocity of 350 rev/min (assumed constant) on its way to the catcher's mitt. What is the angular displacement of the baseball (in radians) as it ...

physics
A meter stick is rotated about the end labeled 0.00 cm, so that the other end of the stick moves through an arc length of 6.04 cm. Through what arc length s does the 25.0-cm mark on the stick move?

physics, science!
A child having a mass of 37 kg sits 0.2 m from the center of a merry-go-round that is rotating with a period of 36 s. What is the centripetal force acting on the child? What is the centripetal force in Newtons?

physics, science!!!
A child having a mass of 37 kg sits 0.2 m from the center of a merry-go-round that is rotating with a period of 36 s. What is the centripetal force acting on the child?

physics, science
What centripetal force is needed to keep a 10 kg object moving at a constant speed of 10 m/s in a circle having a radius of 11 m?

Physics II
1.given 30 m^3 of helium at 15 degree c and 1.0x10^5 Pa, determine the volume at -6 degree c and 5.6x10^4 Pa 2. if a mass of gas occupies 500 l at 16 degree c and 10^5 Pa,determine the volume at 38 degree c and 1.7x10^5 Pa. 3. Calculate the final temperature required to change...

Physics II
find the pressure at the bottom of a vessel 76cm deep when filled with a) water b)mercury (sp.g. 13.6)

Physics II
find the velocity of escape of water through a small opening in a broiler where the pressure is 10^6 Pa above atmospheric pressure, assumed h1=h2 and v1=0

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