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