Fredrick
Most popular questions and responses by Fredrick
Physics
Kelly is driving a car with a mass of 800 kilograms in a south direction with a speed of 18 meters/second. Dominic is driving a truck with a mass of 1500 kilograms with a velocity of 15 meters/second to the east. They undergo perfectly inelastic collision.
asked on March 27, 2013 
Physics
George pushes a wheelbarrow for a distance of 12 meters at a constant speed for 35 seconds by applying a force of 20 newtons. What is the power applied to push this wheelbarrow? A. 1.2 watts B. 3.4 watts C. 6.9 watts D. 13 watts
asked on March 19, 2013 
Physics
A baseball with a mass of 0.15 kilograms collides with a bat at a speed of 40 meters/second. The duration of the collision is 8.0 × 103 seconds. The ball moves off with a speed of 50 meters/second in the opposite direction. What is the value of the
asked on March 15, 2013 
Physics
A ball with a mass of 0.50 kilograms is moving at a speed of 1.8 meters/second along the positive xaxis. It collides with another ball of the same mass travelling at a speed of 2.0 meters/second toward the positive yaxis. Both balls then start moving
asked on March 13, 2013 
Physics
What is the momentum of a 1.5 × 103 kilogram van that is moving at a velocity of 32 meters/second? A. 46.9 kilogram meters/second B. 4.7 × 103 kilogram meters/second C. 4.85 × 102 kilogram meters/second D. 4.85 × 104 kilogram meters/second
asked on March 13, 2013 
geometry
finish proof given ABCD is an isoceles trapezoid with AD parallel to BC; DE=DC prove ABED is a parallelogram
asked on October 27, 2007 
chem
18.1g of ammonia and 90.4g of copper(II) oxide are used in the reaction 2NH3+3CuO=N2+3Cu+3H3O.What is the limiting reactant? How many grams of nitrogen will be formed?
asked on March 18, 2014 
Physics
Before a collision, the xmomentum of an object is 8.0 × 103 kilogram meters/second, and its ymomentum is 1.2 × 104 kilogram meters/second. What is the magnitude of its total momentum after the collision? A. 1.4 × 104 kilogram meters/second B. 2.0 ×
asked on March 13, 2013 
Physics
What amount of heat is required to raise the temperature of 350 grams of copper to cause a 25°C change? The specific heat of copper is 0.39 J/g°C A. 2500 joules B. 2600 joules C. 3400 joules D. 3900 joules
asked on April 24, 2013 
Physics
Mason lifts a box off the ground and places it in a car that is 0.50 meters high. If he applies a force of 8.0 newtons to lift this suitcase, what is the work done? A. 0 joules B. 4.0 joules C. 4.0 × 101 joules D. 4.0 × 102 joules
asked on March 13, 2013 
physics
A boy of mass 40kg sits at point of 2.0m from the pivot of see saw . Find the weight of a girl who can balance the see saw by sitting at a distance of 3.2 m from the pivot . (Take g = 10 Nkg1)
asked on June 2, 2019 
math
three towns A,B,C are situated such that AB is equal to 60km and AC is 100km.The bearing of C from A is 290degree and the bearing of B from A is 060 degree calculate a)the distance BC b)the bearing of B from C
asked on January 20, 2016 
Physics
For a given launch velocity, at which launch angle does the projectile undergo the maximum horizontal displacement? A. 35° B. 45° C. 75° D. 80° E. 90°
asked on February 27, 2013 
math: optimising
I cant figure out this homework question! I need to use optimisation to find the answer but I cant work it out :( There is a rectangular garden which is in need of fencing. Three sides of the 30m wide garden are already fenced. You own an additional 20m of
asked on August 8, 2014 
Math: Optimising
cant figure out this homework question! I need to use optimisation to find the answer but I cant work it out :( There is a rectangular garden which is in need of fencing. Three sides of the 30m wide garden are already fenced. You own an additional 20m of
asked on August 9, 2014 
algebra
Is a rectangle with 14in in length and 7in in width proportional to a rectangle with 21inches in length and 15 inches in with
asked on December 8, 2014 
Algebra
Find the value of the expression p^2q^2+pq–q^3–p^3 for p=0.5 and q = −0.5
asked on February 4, 2017 
Science
How does a butt work?
asked on February 1, 2016 
riddles
it can pass through doors it can travel great distances even the world but all the time,it stays in a corner
asked on July 28, 2009

computers
Education is the best legacy
posted on April 3, 2017 
AP Chem
no
posted on February 5, 2017 
math
An amplifier has an input power of 5 mW. The output power is 100 mW. What is the decibel gain to the nearest decibel?
posted on March 21, 2016 
Math: Optimising
I think the question means 3 sides of the rectangle are already fenced and you have 21m of extra fencing for the remaining side? :/ But I really have no idea..
posted on August 10, 2014 
Maths  Optimisation
Oh I see, thankyou for your help!!
posted on August 8, 2014 
algebra
14
posted on October 27, 2007 
geometry
ther is no e and f it a two column proof statements reasons 1.AD parr.BC;DE=DC 1.given 2.AB=DC 2.def of isos trap 3.
posted on October 27, 2007