physics exam 1 review

The components of vectors and are given as follows: Ax = 6.7 Bx = -4.0 Ay = -7.6 By = -8.6 What is the magnitude of the vector difference B- A?

10.75

A stone is thrown horizontally with an initial speed of 10 m/s from the edge of a cliff. A stopwatch measures the stone's trajectory time from the top of the cliff to the bottom to be 2.0 s. What is the height of the cliff if air resistance is negligibly small?

19.6

If a net force accelerates a 2.0-kg tool at 10 m/s2, what acceleration would that same net force give to a 10-kg tool?

2 m/s^2

What magnitude net force is required to accelerate a 1000-kg car uniformly from 0 m/s to 20.0 m/s in 10 s?

2000N

The x component of vector A is 3.0 units, and its y component is - 5.5 units. What is the angle that vector A makes with the +x-axis?

299*

A car starts from rest and accelerates at a steady 10.00 m/s2. How far does it travel in the first 5.00 s?

Position as function of acceleration and time, 𝑥=x0+v0t+1/2at^2 x=0+0+1/2(10m/s^2)(5s)^2 x= 125m

A car accelerates from 2 m/s to 10 m/s at a constant rate of 4 m/s2 . How far does it travel while accelerating?

Position as function of acceleration and velocity, 𝑣2 = 𝑣0^2 + 2𝑎∆x (10m/s)^2=(2m/s)^2 + 2(4m/s)∆x ∆x=12 m

An object is moving in a straight line with constant acceleration. Initially, it is traveling at 10 m/s. Four seconds later it is traveling at 6 m/s. How far does it move during this time?

Position as function of time and velocity, Position as function of time and velocity,. 𝑥 = 𝑥0 + 1/ 2 (𝑣 + 𝑣0)t x=0+1/2 (6m/s + 10m/s) (4s)=32