1. Convert the following: a. 15.0 kg to N
b. 85.0 N to kg
c. 220 lb to N
d. 550 N to lb.
2. What force is needed to accelerate the stone of
mass 25.0 kg upward at 5.00 m/s2?
Draw a free body diagram.

3. A rocket that weighs 7850 N on the earth is fired.
The force of propulsion is 1.04 x 104 N.
a. Find the mass of the rocket.
b. The acceleration of the rocket
c. The velocity of the rocket at the end of 10.0 s.
d. The displacement at the end of the above time
frame ( 10.0 s)
4. A force of 15.0 N is necessary to keep the 4.0 kg
wooden block moving along a table top at a uniform
velocity . Calculate the co-efficient of friction.
5. A car moving on a high way has a mass of 400 kg.
The coefficient of friction between the tire and the
car is 0.2. What acceleration will a force of 2500 N
produce on the car?

The a metal retainer that keeps the rolling elements evenly spaced. n a. seal n b. separator n c. bearing n d outer race

Ann walks 80 meters on a straight line 33 ∘ north of east starting at point 1. draw ann's path. represent ann's walk with a vector of length 80 meters. draw the vector starting at point 1. the length given in the display is in meters.

Follow these directions and answer the questions. 1. shine a pencil-thin beam of light on a mirror perpendicular to its surface. (if you don't have a laser light as suggested in the video, you can make a narrow beam from a flashlight by making a cone from black construction paper and taping it over the face of the flashlight.) how does the light reflect? how does the relationship of incident to reflected ray relate to the reflection of water waves moving perpendicular to a barrier? 2. shine a pencil-thin beam of light on a mirror standing on a sheet of paper on the table (or floor) so that you can mark the incident ray and reflected ray. (you can support the mirror from the back by taping it to a wooden block.) 3. mark a line on the paper representing the reflective surface. (the reflective surface of a mirror is usually the back edge.) 4. draw a dashed line perpendicular to the mirror surface at a point where the incident and reflected ray meet. this perpendicular is called a normal to the surface. 5. measure the angles between the rays and the normal. the angle of incidence is the angle formed by the incident ray and the normal to the surface. the angle formed by the reflected ray and normal is called the angle of reflection (r). what is the angle of incidence? what is the angle of reflection? 6. repeat for several different angles. (see report sheet for details.) what appears to be the relationship between the angle of incidence and angle of reflection? in science 1204, what was the relationship for these two angles made by the reflection of waves in a ripple tank? 7. roll a ball bearing so that it hits a fixed, hard surface (a metal plate) at several angles (including head-on). observe the way in which the ball bearing reflects. what generalization can you make about how a ball bearing reflects from a wall? have you proved that light can only behave like a wave?