# Fredrick

Most popular questions and responses by Fredrick
1. ## 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.

2. ## 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

3. ## 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 × 10-3 seconds. The ball moves off with a speed of 50 meters/second in the opposite direction. What is the value of the

4. ## Physics

A ball with a mass of 0.50 kilograms is moving at a speed of 1.8 meters/second along the positive x-axis. It collides with another ball of the same mass travelling at a speed of 2.0 meters/second toward the positive y-axis. Both balls then start moving

5. ## 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

6. ## geometry

finish proof given ABCD is an isoceles trapezoid with AD parallel to BC; DE=DC prove ABED is a parallelogram

7. ## 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?

8. ## Physics

Before a collision, the x-momentum of an object is 8.0 × 103 kilogram meters/second, and its y-momentum 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 ×

9. ## 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

10. ## 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

11. ## 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 Nkg-1)

12. ## 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

13. ## 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°

14. ## 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

15. ## 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

16. ## 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

17. ## Algebra

Find the value of the expression p^2q^2+pq–q^3–p^3 for p=0.5 and q = −0.5

18. ## Science

How does a butt work?

19. ## riddles

it can pass through doors it can travel great distances even the world but all the time,it stays in a corner

1. ## computers

Education is the best legacy

posted on April 3, 2017
2. ## AP Chem

no

posted on February 5, 2017
3. ## 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
4. ## 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
5. ## Maths - Optimisation

Oh I see, thankyou for your help!!

posted on August 8, 2014
6. ## algebra

14

posted on October 27, 2007
7. ## 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