Thursday
December 18, 2014

Posts by arcos15


Total # Posts: 45

Physics
When we say that the weight of an object is Mg, and that g = 9.8 N/kg, what assumptions are we making? Which of the below? -The distribution of mass in the earth is spherically symmetric. -The density of the earth is the same everywhere. -The earth's interior is solid ...
January 25, 2013

Physics
When we say that the weight of an object is Mg, and that g = 9.8 N/kg, what assumptions are we making? Which of the below? The distribution of mass in the earth is spherically symmetric. The density of the earth is the same everywhere. The earth's interior is solid ...
January 25, 2013

Physics LAST QUESTION
A beetle whose mass is 2 g sits on a turntable at a distance of 12 cm from the center. The turntable is rotating at 33 rpm. (a) What are its acceleration and the centripetal force on it? a =______ m/s2 Fc=_____ N (b) What is the interaction that provides the centripetal force...
November 4, 2012

Physics help
A beetle whose mass is 2 g sits on a turntable at a distance of 12 cm from the center. The turntable is rotating at 33 rpm. (a) What are its acceleration and the centripetal force on it? a =______ m/s2 Fc=_____ N (b) What is the interaction that provides the centripetal force...
November 3, 2012

Physics help
A car travels in a circle whose radius is 31 m, with a speed of 19 m/s. (1) What is the magnitude of the car's acceleration? _____ m/s2 (2) What is the nature (origin) of the horizontal force on the car? (What is exerting the force?) The force causing the car to turn is: ...
October 28, 2012

Physics help
Two masses m1 = 2 kg and m2 = 4 kg are connected by a light string. Mass m2 is connected to mass M = 14 kg by a string that passes over an ideal pulley. Determine the following quantities when the system is released from rest. (a) The acceleration of the masses m/s2 (b) The ...
October 26, 2012

Physics help
You are pushing three equal boxes, 8kg each, with a force of 250 on the first. What is the magnitude of the force of the first box on the second box? _________N What is the magnitude of the force of the third box on the second? _________N
October 26, 2012

Physics help
You are pushing three equal boxes, 8kg each, with a force of 250 on the first. What is the magnitude of the force of the first box on the second box? _________N What is the magnitude of the force of the third box on the second? _________N
October 26, 2012

Physics help
You are pushing three equal boxes, 8kg each, with a force of 250 on the first. What is the magnitude of the force of the first box on the second box? _________N What is the magnitude of the force of the third box on the second? _________N
October 26, 2012

Physics help
A 5 kg block is pulled from rest along a horizontal surface by a rope with a force of 12 N. It experiences a constant frictional force of 1 N. How far has the block moved in the first six seconds?
October 26, 2012

physics help
Two 12.0 kg boxes are connected by a massless string that passes over a massless frictionless pulley as shown above. The boxes remain at rest, with the one on the right hanging vertically and the one on the left d = 2.9 m from the bottom of an inclined plane that makes an ...
October 19, 2012

Last Question Physics.
A diagram represents a 5 N force to the North and a 12 N force East acting on an object P of mass 6.5kg. -The Magnitude of the Net Force is 13 N - The direction it accelerates is 23 degrees North of East. FIND: (A) If the object has an intial speed of 8 m/s in the direction ...
October 9, 2012

Physics
A 19 N thrust is exerted on a 0.4 kg rocket for a time interval of 8 s as it moves straight up. (Neglect all forces except this thrust and the force of gravity.) The rocket then continues to move upward as its speed reduces steadily to zero. (a) What is the maximum height that...
October 9, 2012

Physics
.99
October 9, 2012

Physics
A crate of unknown mass is pulled upward by a rope. The tension in the rope is 11 N and the crate accelerates upward at a rate of 1.3 m/s2. Determine the mass of the crate. _________kg
October 9, 2012

Help Physics
A child with a mass of 39 kg stands on a spring scale inside an elevator. For each of the scenarios below, draw a force diagram of the forces acting on the child and calculate the reading of the scale in newtons. (a) The elevator is at rest. _______ N (b) The elevator is ...
October 9, 2012

Physics
A 19 N thrust is exerted on a 0.4 kg rocket for a time interval of 8 s as it moves straight up. (Neglect all forces except this thrust and the force of gravity.) The rocket then continues to move upward as its speed reduces steadily to zero. (a) What is the maximum height that...
October 9, 2012

Algebra
Use the Pythagorean Theorem
October 9, 2012

Physics
A 2 kg block is pulled from rest along a horizontal surface by a rope with a force of 16 N. It experiences a constant frictional force of 3 N. How far has the block moved in the first five seconds?
October 9, 2012

Calculus
I need help solving for this final problem to complete my assigment. Please help! Solve for x: ln(x^4)-ln(x^2)=2
September 24, 2012

Calc 1
thanks alot man, wow it makes alot of sense.
September 24, 2012

Calculus
I need help solving for this final problem to complete my assigment. Please help! Solve for x: ln(x^4)-ln(x^2)=2
September 24, 2012

Calc 1
I need help solving for this final problem to complete my assigment. Please help! Solve for x: ln(x^4)-ln(x^2)=2
September 24, 2012

Physics
A particle's motion is described by x(t)=8t-2t2. (where x is in meters and t is in seconds) f) How fast is the particle moving at t=3s? ______m/s g) How much is it acceleration at t=3s? ______m/s2
September 23, 2012

Physics
F1 and F2 are two horizontal forces of 70 N each, acting on a wagon. They are at 45° to the x-axis and at right angles to each other. A third force, F3, also 70 N, acts along the positive x-axis. What if, instead, F2 acted in the opposite direction from what is shown? Find...
September 23, 2012

Physics
A car is traveling at a constant negative velocity of 12.0 m/s. The driver steps on the brakes. The car slows to a stop. The car travels 10.0 m while it is slowing down. What is the magnitude of its acceleration? [HINT: Pay attention to direction.] ________m/s2
September 21, 2012

Physics
A juggler performs in a room with a ceiling 2.71 m above hand level. What is the maximum upward speed (in m/s) which she can give a ball without letting it hit the ceiling? _________m/s
September 21, 2012

Physics
An object moves in the +x direction at a speed of 30 m/s. As it passes through the origin, it starts to experience a constant acceleration of 3.7 m/s2 in the -x direction. (b) How much time elapses before the object returns to the origin? _____________s
September 21, 2012

PHYSICS
A car is moving in the +x direction with the following position equation of motion: x = 5.41(m/s)t - 2.7(m/s^2)t^2. (a) What is the initial velocity of the car? 5.41 m/s (b) What is the acceleration of the car? -5.4 m/s^2 (c) At what time does the car come to rest? __________ ...
September 21, 2012

Physics
A car is moving in the +x direction with the following position equation of motion: x = 5.41(m/s)t - 2.7(m/s^2)t^2. (a) What is the initial velocity of the car? 5.41 m/s (b) What is the acceleration of the car? -5.4 m/s^2 (c) At what time does the car come to rest? __________ ...
September 21, 2012

Physics
A car traveling 56 km/h is 22.0 m from a barrier when the driver slams on the brakes. The car hits the barrier 2.15 s later. (a) Assuming constant acceleration, what was the magnitude of the car's acceleration before impact? _______ m/s2 (b) How fast was the car traveling ...
September 19, 2012

Physics
A stone is thrown vertically upward from outside a window, with an initial velocity of 24.0 m/s. It moves up, and then down to the ground 420 m below the point where it started. Let `up' be positive. (a) What is the maximum height above the window to which the stone rises...
September 19, 2012

Physics
nevermind, it's suppose to be negative 93.9. thanks
September 19, 2012

Physics
thanks, but C is incorrect any idea why?
September 19, 2012

Physics
A stone is thrown vertically upward from outside a window, with an initial velocity of 24.0 m/s. It moves up, and then down to the ground 420 m below the point where it started. Let `up' be positive. (a) What is the maximum height above the window to which the stone rises...
September 19, 2012

Physics
A car traveling 56 km/h is 22.0 m from a barrier when the driver slams on the brakes. The car hits the barrier 2.15 s later. (a) Assuming constant acceleration, what was the magnitude of the car's acceleration before impact? _______ m/s2 (b) How fast was the car traveling ...
September 19, 2012

Physics
A jogger runs eastward in a straight line with an average speed of 2.25 m/s for 4.98 min and then continues with an average speed of 1.58 m/s for 2.18 min. (Hint: time is in minutes and velocity is in meters/second) (a) What is her total displacement (in m)? _____________m (b...
September 13, 2012

Physics
The strength of attraction, Fm, between two magnets can be described as Fm~1/d2. You separate the two magnets from d=1 cm to d=7 cm. a) Does the strength of attraction increase or decrease? -decrease -increase b) By what factor does Fm change? -1/36 -49 -36 -1/49 -6 -1/6 -1/7 -7
September 10, 2012

Physics
95LBS AND C
September 10, 2012

Physics
A sign whose weight is 95 lbs is held up by a chain. (1) With what force does the chain need to be pulled up to keep the sign in place? ___________ lbs (2) Jenna writes a mathematical description, 95 lbs + - 95 lbs = 0. What does the sign of each number represent? MULTIPLE ...
September 10, 2012

physics
To make a large-scale representation of a hydrogen atom in its ground state, you start with a super ball (D=3.74 cm) to represent the nucleus. How far away, R, in km will you have to put the representation electron?
September 7, 2012

physics
To make a large-scale representation of a hydrogen atom in its ground state, you start with a super ball (D=3.74 cm) to represent the nucleus. How far away, R, in km will you have to put the representation electron?
September 7, 2012

Chemistry
Consider the resonance structures for the carbonate ion. O--C-O(-) l O(-) (-)O-C--O l O(-) (-)O-C-O(-) l l O How much negative charge is on each oxygen of the carbonate ion? A)0, B) -.33, C)-.50, D) -.67, E)-1.00, F)-1.33, G)-1.50, H)-1.67, I)-2.00 What is the bond order of ...
July 2, 2012

Chemistry
A 0.02847 g sample of gas occupies 10.0-mL at 292.0 K and 1.10 atm. Upon further analysis, the compound is found to be 38.734% C and 61.266% F. What is the MOLECULAR formula of the compound?
July 2, 2012

Chemistry
A 0.02847 g sample of gas occupies 10.0-mL at 292.0 K and 1.10 atm. Upon further analysis, the compound is found to be 38.734% C and 61.266% F. What is the molecular formula of the compound? __________________?
July 2, 2012

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