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August 3, 2015

Posts by Sierra


Total # Posts: 258

Physics Please Help ASAP
thank you so much! super helpful i didn't realize i was overlooking the radius of earth!
November 26, 2012

Physics Please Help ASAP
Suppose the space shuttle is in orbit 390 km from the Earth's surface, and circles the Earth about once every 92.4 minutes. Find the centripetal acceleration of the space shuttle in its orbit. Express your answer in terms of g, the gravitational acceleration at the Earth&#...
November 26, 2012

physics
there's no question, just a bunch of information about the situation
November 26, 2012

Physics ASAP
Suppose the space shuttle is in orbit 390 km from the Earth's surface, and circles the Earth about once every 92.4 minutes. Find the centripetal acceleration of the space shuttle in its orbit. Express your answer in terms of g, the gravitational acceleration at the Earth&#...
November 26, 2012

Physics ASAP
Use the following numbers for this question. MEarth 5.98e+24 kg MJupiter 1.9e+27 kg MSun 2e+30 kg Earth-Sun distance 150000000000 m Jupiter-Sun distance 778000000000 m rE 6380000 m rJ 69000000 m G = 6.67e-11 Nm2kg-2 the acceleration due to gravity at the surface of Jupiter has...
November 18, 2012

Trig
Give: a=alpha B=beta csc a= 2 pi/2<a<pi secB=-3 pi/2<B<pi 1)find sin(a+B) 2)find tan(a-B) 3)cos B/2 4)sin a/2
November 7, 2012

trig
How do you find the exact value of sin 5pi/8?
November 7, 2012

Physics
a quaterback throws a ball to a stationary reciver wo is 15.2m down the feild. the football is thrown at an initial angle of 42 dagrees. acceleration is 9.81m/s^2. what is the initial speed that quaterback must throw the ball to hit the reciver?
October 23, 2012

physics
Consider again the problem of a car traveling along a banked turn. Sometimes roads have a "reversed" banking angle. That is, the road is tilted "away" from the center of curvature of the road. If the coefficient of static friction between the tires and the ...
October 1, 2012

physics
A compact disc spins at 2.7 revolutions per second. An ant is walking on the CD and finds that it just begins to slide off the CD when it reaches a point 2.8 cm from the CD's center.
October 1, 2012

physical science
what is the density of a peice of wood that has a mass of 25.0 grams and a volume of 29.4cm cubes?
September 13, 2012

math
would you use perimeter or area to find the quanity of track needed for a tabletop railroad
August 22, 2012

Physics
A snake is sunning itself on a rock. (a) If the snake is 0.5 m long, what is the approximate amount of radiation it absorbs from the Sun in 11 min? (Assume the snake has a cylindrical shape and ignore both ends, a radius of 0.03 m, and a mass of 2.1 kg. Assume also that the ...
July 31, 2012

Physics
The intensity of sunlight at the the top of the Earth's atmosphere is about 1350 W/m2. (The intensity at the surface of the Earth is somewhat smaller due to absorption and reflection by the atmosphere.) What is the total power emitted by the Sun?
July 31, 2012

Physics
Use the exact values you enter in previous answer(s) to make later calculation(s). Energy-efficient windows are constructed with two panes of glass separated by an air gap (see figure below). In a typical window of this type, the air gap makes a huge difference in the rate of ...
July 31, 2012

Physics
A rectangular aluminum plate has an area of 0.41 m2 at 23°C. If it is heated until its area has increased by 4.4 10-6 m2, what is the final temperature of the plate? °C
July 31, 2012

Physics
Your swimming pool is square and 4.9 m on a side. It is 3.9 m deep in the morning. If the temperature changes by 44°C during the afternoon, how much does the depth of the water increase?
July 31, 2012

Physics
If you combine 34 kg of ice at 0°C with 80 kg of steam at 100°C, what is the final temperature of the system? °C
July 31, 2012

Physics
You drop 378 g of solid ice at −35°C into a bucket of water (1,200 g) at 45°C. Eventually, the ice all melts, and the entire system comes into thermal equilibrium. Find the final temperature of the system.
July 31, 2012

Physics
An ice cube of volume 17.7 cm3 is initially at a temperature of -19.3°C. How much heat is required to convert this ice cube into steam?
July 31, 2012

Physics
How much heat is required to raise the temperature of a 4.3-kg block of steel by 48 K? (The specific heat of this steel is 450 J/kg · K.)
July 31, 2012

Physics
A tank of water sits at the edge of a table of height 1.4 m. The tank springs a very small leak at its base, and water sprays out a distance of 1.2 m from the edge of the table. What is the water level h in the tank? (Assume the tank is open to the air at the top.)
July 25, 2012

Physics
Water is flowing through a pipe (area 4.0 cm2) that connects to a faucet adjusted to have an opening of 0.57 cm2. If the water is flowing at a speed of 5.3 m/s in the pipe, how long does it take for water from the faucet to fill a bucket of volume 0.11 m3?
July 25, 2012

Physics
Two metal blocks are attached by a cable as shown in the figure below and are submerged at rest near the surface of a lake. If the volumes are V1 = 2.1 m3 and V2 = 1.1 m3, what is the total buoyant force on the two blocks?
July 25, 2012

Physics
You want to design a helium-filled balloon that will lift a total payload of 1225 kg. What volume of helium is needed to just barely lift this payload?
July 25, 2012

Physics
A block of mass 20 g sits at rest on a plate that is at the top of the fluid on one side of a U-tube as shown below. The U-tube contains two different fluids with densities ρ1 = 965 kg/m3 and ρ2 = 550 kg/m3 and has a cross sectional area A = 5.5 10-4 m2. The surfaces...
July 25, 2012

Physics
A syringe has an area of 1.4 cm2 at its barrel and then narrows down to an area of 0.08 mm2 at the needle end. If a force of 5.5 N is applied to the syringe, what is the force produced at the tip of the needle?
July 25, 2012

Physics
A bucket is filled with a combination of water (density 1,000 kg/m3) and oil (density 700 kg/m3). These fluids do not mix. (The oil will float on top of the water.) If the layer of oil is 63 cm tall, what is the pressure at the interface between the oil and the water?
July 25, 2012

Physics
A U-tube contains two fluids with densities ρ1 = 1070 kg/m3 and ρ2 = 595 kg/m3 as sketched below. What is the difference d in the heights of the top surfaces of the two fluids?
July 25, 2012

Microbiology
What responsibilities do patents have for their children's health?
July 15, 2012

trig
Solve the equation on the interval [0,360) cos^2t+2cos(t)+1=0
July 12, 2012

trig
Find all solutions in the interval [0,360) sin(4t)=ã3/2
July 12, 2012

Physics
Nothing
July 11, 2012

physics
You are pushing a refrigerator across the floor of your kitchen. You exert a horizontal force of 273 N for 7.2 s, during which time the refrigerator moves a distance of 3.4 m at constant velocity.
July 11, 2012

Physics
A rock of mass 0.086 kg is thrown upward with an initial speed of 13 m/s. Find the work done by gravity on the rock from the time it leaves the thrower's hand until it reaches the highest point on its trajectory. Hint: You do not have to calculate the rock's maximum ...
July 11, 2012

Physics
A car of mass 1,700 kg is initially traveling at a speed of 25 m/s. The driver then accelerates to a speed of 35 m/s over a distance of 500 m. Calculate the change in the kinetic energy of the car.
July 11, 2012

Physics
A car of mass 1,700 kg is initially traveling at a speed of 25 m/s. The driver then accelerates to a speed of 35 m/s over a distance of 500 m. Calculate the change in the kinetic energy of the car.
July 11, 2012

Physics
A block of mass is pulled along a rough horizontal surface by a rope as sketched in the figure below. The tension in the rope is 45 N, and the coefficient of kinetic friction between the block and the surface is
July 11, 2012

Physics
A crate of mass 29 kg is pushed up a ramp by a person as shown in the figure below. The person pushes the crate a distance of 25 m as measured along the ramp. Assume the crate moves at constant velocity. Assume the coefficient of kinetic friction between the crate and the ramp...
July 11, 2012

Physics
A crate of mass 59 kg is pushed across a level floor by a person. If the person exerts a force of 30 N in the horizontal direction and moves the crate a distance of 12 m, what is the work done by the person?
July 11, 2012

English
i can not seem to find who the Fictional Character Justice Johnson is, i dont even see it anywhere in my book?
July 10, 2012

Physics
A sphere of mass 85 kg is attached to one end of a rope as shown in the figure below. It is found that the rope does an amount of work W = 8030 J in pulling the sphere upward through a distance 9.6 m. Find the tension in the rope.
July 6, 2012

Physics
Speed of a satellite orbit (physics problem)? What is the speed of a satellite in a geosynchronous orbit about Earth? _________m/s Compare it with the speed of the Earth as it orbits the Sun. _________m/s
June 29, 2012

Physics
In recent years, a number of nearby stars have been found to possess planets. Suppose, the orbital radius of such a planet is found to be 3.0 1011 m, with a period of 1000 days. Find the mass of the star.
June 29, 2012

Physics
Saturn makes one complete orbit of the Sun every 29.4 years. Calculate the radius of the orbit of Saturn. Hint: It is a very good approximation to assume this orbit is circular.
June 29, 2012

Physics
A stone of mass 0.31 kg is tied to a string of length 0.65 m and is swung in a horizontal circle with speed v. The string has a breaking-point force of 70 N. What is the largest value v can have without the string breaking?
June 29, 2012

Physics
Consider points on the Earth's surface as sketched in the figure below. Because of the Earth's rotation, these points undergo uniform circular motion. Compute the centripetal acceleration at the following points.
June 29, 2012

Physics
Suppose the circular track in the figure below has a radius of 104 m and the runner has a speed of 3.3 m/s.
June 29, 2012

Physics
Suppose the circular track in the figure below has a radius of 104 m and the runner has a speed of 3.3 m/s.
June 29, 2012

Physics
A jogger is running around a circular track of circumference 480 m. If the jogger has a speed of 11 km/h, what is the magnitude of the centripetal acceleration of the jogger?
June 28, 2012

Physics
Mars has two moons, Phobos and Deimos. It is known that the larger moon, Phobos, has an orbital radius of 9.4 106 m and a mass of 1.1 1016 kg. Find its orbital period.
June 25, 2012

Physics
Uranus makes one complete orbit of the Sun every 83.8 years. Calculate the radius of the orbit of Uranus. Hint: It is a very good approximation to assume this orbit is circular.
June 25, 2012

Physics
The region of the solar system between Mars and Jupiter contains many asteroids that orbit the Sun. Consider an asteroid in a circular orbit of radius 4.3 1011 m. Find the period of the orbit.
June 25, 2012

Physics
Find the gravitational force of the Sun on Jupiter.
June 25, 2012

Physics
The track near the top of your favorite roller coaster has a circular shape with a diameter of 36 m. When you are at the top, you feel as if you weigh only one-fifth of your weight on the ground. What is the speed of the roller coaster?
June 25, 2012

Physics
The track near the top of your favorite roller coaster has a circular shape with a diameter of 36 m. When you are at the top, you feel as if you weigh only one-fifth of your weight on the ground. What is the speed of the roller coaster?
June 25, 2012

Physics
What is the minimum speed the rock can have without the string becoming "slack"? (The rock is traveling in vertical circle. Assume that m = 1.6 kg and r = 0.48 m.)
June 22, 2012

Physics
Consider the motion of the rock in the figure below. What is the minimum speed the rock can have without the string becoming "slack"? (The rock is traveling in vertical circle. Assume that m = 1.6 kg and r = 0.48 m.)
June 22, 2012

Physics
A bicycle wheel of radius 0.2 m is spinning at a rate of 70 revolutions per minute.
June 22, 2012

Physics
A soccer ball is kicked with an initial speed of 27 m/s at an angle of 20° with respect to the horizontal. A) find the maximum height reached by the ball. B) find the speed of the ball when it is at the highest point on its trajectory. C) where does the ball land? That is ...
June 20, 2012

Physics
A soccer ball is kicked with an initial speed of 27 m/s at an angle of 20° with respect to the horizontal.
June 20, 2012

Physics
A quarterback is asked to throw a football to a receiver that is 32.6 m away. What is the minimum speed that the football must have when it leaves the quarterback's hand? Ignore air resistance. Assume the ball is caught at the same height as it is thrown.
June 20, 2012

Physics
A cable attached to a block of mass 8 kg pulls the block along a horizontal floor at a constant velocity. If the tension in the cable is 5.3 N, what is the coefficient of kinetic friction between the block and the floor?
June 20, 2012

Physics
Two children are playing on a 154-m-tall bridge. One child drops a rock (initial velocity zero) at t = 0. The other waits 1.1 s and then throws a rock downward with an initial speed v0. If the two rocks hit the ground at the same time, what is v0
June 20, 2012

Physics
A squirrel is resting in a tall tree when it slips from a branch that is 43 m above the ground. It is a very agile squirrel and manages to land safely on another branch after only 0.47 s. What is the height of the branch it lands on?
June 20, 2012

social studies
what is one important difference between the koreas and japan 1)korea has may mountains 2)japan is not crowded but korea is 3)the korean peninsula is on stable ground 4)koreas mineral resources are used and japans are not
March 16, 2012

physics
A cube of lead measuring 1 meter on each side is thrown into the ocean. Determine the buoyant force acting on this mass of lead. The density of lead is 11.4 grams/ cubic centimeter
March 8, 2012

physics
The pressure under the surface of a liquid increases with depth. Determine the pressure in Newtons per square meter on a lake at a depth of 100 meters (over 300 feet).
March 8, 2012

algebra
can you simplify Simplify 5m - 13n - n + 4m
February 16, 2012

Civics
i have no book!
February 15, 2012

Civics
Well is it number 3?
February 15, 2012

Civics
Which statement about the relationship between the president and the Cabinet is false? =Because the president is so busy, members of the Cabinet often have a good deal of leeway in the running of their departments. Not all executive departments are subject to presidential ...
February 15, 2012

Civics
Article II of the United States Constitution established the _____. presidency only presidency and the vice presidency the vice presidency only =the Senate and the House
February 14, 2012

Civics
Since the 1970s, the Supreme Court has interpreted the Equal Protection Clause as prohibiting the government from making "_____" distinctions between people. unreasonable =racial reasonable unnecessary
February 14, 2012

American Government
There is stuff about alabama. "I have a dream that one day, down in Alabama, with its vicious racists, with its governor having his lips dripping with the words of interposition and nullification; one day right there in Alabama, little black boys and black girls will be ...
February 14, 2012

American Government
Which statement does NOT characterize Martin Luther King Jr.'s "I Have a Dream" speech? 1.)It openly criticized the Governor of Alabama 2.)It supported the peaceful congregation of peoples of all races and religions 3.)It pointed out racial problems in the South ...
February 14, 2012

Civics
Which is NOT true of the segregation laws passed after the Civil War? =They prohibited interracial marriage. They did not only apply to blacks. They were only in the South. All of these statements are true.
February 14, 2012

Civics
The Constitution gives sovereignty only to the _____.? A.State legislatures B.national government C.president of the United States D.State constitutions ....i need help, none of them are right?
February 14, 2012

civics
_____ States supported the _____ Plan, which called for a bicameral legislature in which States would be represented according to their population. Slave, Three-Fifths =Larger, Virginia Northern, Connecticut Smaller, New Jersey
February 14, 2012

Civics
Which of the following was NOT a reason why a stronger central government was needed? To solve the economic problems of the United States =To limit individual liberties To deal with military matters both internal and external To make the States work together as a single ...
February 14, 2012

science
What materials can I use to make an imprint like a fossil?
January 23, 2012

Science
Suppose you find a fossil imprint of an animal that existed many years ago.How can I make a model to compare that imprint to the foot of an animal living today?
January 23, 2012

Civics
Then is it number 3?
January 20, 2012

Civics
Which is NOT a responsibility of the Department of Agriculture? 1. The opening of foreign markets to U.S. agricultural products =2. To oversee federal anti-hunger programs 3. The designation of lands for private and public use 4. Support for farmers with agricultural research
January 20, 2012

art
what is the definition of pattern, in elements of design
December 11, 2011

spanish
how do you say, "what subjects are at your school.?"
December 1, 2011

statistics
Determine the sample size needed in order to be 95 percent confident the p, the sample proportion of HD television sets that last at least five years without a single repair, is within 0.03 of , the true proportion of sets that last at least five years without a single...
November 28, 2011

sciene
how do u research speeches on the internet {worldbiomes}.
November 8, 2011

Algebra
In solving the equation (x + 3)(x + 1) = 48, Eric stated that the solution would be x + 3 = 48 => x = 45 or (x + 1) = 48 => x = 47 However, at least one of these solutions fails to work when substituted back into the original equation. Why is that? Please help Eric to ...
October 13, 2011

Science
A football player has to push a blocking sled the length of a football field. What are two ways the workload for the football player could be increased?
October 11, 2011

Physics 6A
shortcut: \hat
September 21, 2011

Physics
In recent years, a number of nearby stars have been found to possess planets. Suppose, the orbital radius of such a planet is found to be 3.0 1011 m, with a period of 1000 days. Find the mass of the star.
September 20, 2011

math
I can't figure this out this problem.. estimate 20% of 131 by using 10%
May 30, 2011

Calculus 12 Optimization
120
May 19, 2011

calculus
Find f^-1(13), f(x)= 2x^5 + 3x^3 + 8x and find D(f^-1(x)) at x=13. Is this correct... I got 1/27 ??
March 22, 2011

Chemistry
What is the pH of a solution that is comprised of 0.0843 M HCl and 0.0287 M HClO4?
March 7, 2011

Chemistry
aqueous sulfurous acid H2SO3 was made by dissolving 0.200 L of sulfur dioxide gas at 19 C and 745 mm Hg in water to yield 500.0 ml of solution. the acid solution required 12.9 ml of sodium hydroxide solution to reach the titration end point. what was the molarity of the sodium...
February 20, 2011

Chemistry
What is the volume of Tin(Sn)? Mass of sample = 2.588g Initial vol. of water = 31 m/L Final vol. of water = 32 m/L
February 10, 2011

physics
A damped mass-spring system oscillates at 190 Hz. The time constant of the system is 2.0 s. At t = 0, the amplitude of oscillation is 6.5 cm and the energy of the oscillating system is then 65 J. (a) What is the amplitude of oscillation at t = 2.0 s? What is the amplitude at t...
January 31, 2011

physics
The 2 kg block in Figure 7-25 slides down a frictionless curved ramp, starting from rest at a height of h = 3 m. The block then slides d = 12 m on a rough horizontal surface before coming to rest. Figure 7-25 (a) What is the speed of the block at the bottom of the ramp? (b) ...
January 30, 2011

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