Vectors A in polar coordinates and vector B with unit vectors are give. Find a vector sum and a vector difference. Ignore units.

Vector A= 5 units at 53 degrees, and B= 5 i - 2 j in which i and j are unit vectors in x and y directions respectively. PART a. Show A and B and vector sum C in a polygon (Not to scale) showing A + B = C. SEE ATTACHMENT #1 for a diagram showing known data for A and B, and also a general triangle for showing law of cosines and ...continues

A boat leaves one bank of a river and heads in such a direction as to arrive at a point downstream and across the river.

A certain river is 2000 meters wide and flows Southward at 6.2 m/sec. The boat's speed relative to the water is 15 m/sec. From a point on the West bank the boat points in such a direction that it travels in a straight line to point Q on the East bank, 550 meters downstream. Find the direction the boat must point to do this. SEE ...continues

Motion

As a baseball is being thrown, it goes from 0 to 40m/s in 0.15s. What is the acceleration of the baseball? Please show the work. Thank you

Motion

In 1993, the world record in the 200-m dash was 19.72s. What was the average speed in m/s? What was the average speed in mph? please show work!

motion

A train, initially stationary, has a constant acceleration of 0.5m/s squared. What is its speed after 15s? What would be the total time it would take to reach a speed of 25m/s?

motion

A rock is dropped off the side of a bridge and hits the water below 2 seconds later. What was the rock's velocity when it hit the water? What was the rock's average velocity as it fell?

Newton's laws

The mass of a certain elephant is 1,130kg. What is the elephant's weight in Newton's? Please show the work.

Newton's laws

In an experiment performed in a space station, a force of 60 Newtons causes an object to have an acceleration equal to 4 meters/sec squared. What is the objects mass?

Newton's laws

The mass of a fist during a particular karate blow is measured to be about 3,500m/s squared. If the mass of the fist was approximately 0.7kg, what was the maximum force?

Newton's laws

As a baseball is being caught, its speed goes from 30 to 0 m/s in about 0.005 seconds. Its mass is 0.145kg. What is the baseball's acceleration in m/s squared and in grams? What is the size of the force acting on it?