Scientific notation and Measurements
What is Accuracy?
How close a measured value is to the expected value.
Convert 625 grams to kilograms, how many significant figures are there?
0.625 kg , 3 significant figures
What is the difference between speed and velocity?
Speed only has a magnitude (scalar), Velocity has magnitude and direction (vector).
An object in free fall undergoes an increase in
Speed
In a situation with no air resistance, horizontal velocity is constant when considering projectile motion.
True or false?
True
What is Precision?
How close measured values are to one another.
Convert 3000 seconds to hour(s) maintain two significant figures
0.83 hours
The average speed of a horse that gallops 10 kilometers in 1/2 an hour is
20 km/h
As soon as a bowling ball rolls off the edge of a table, the magnitude of its horizontal component of velocity
remains constant
In a situation with no air resistance, vertical velocity is constant when considering projectile motion.
True or false?
False
Put 856,000 N in scientific notation
8.56x105 N
convert 600 centimeters to meters
6 meters
A vehicle undergoes acceleration when it:
gains speed.
loses speed.
changes its direction.
All answers are correct
A ball rolls off the edge of a table at the same time another ball drops vertically from the same table. Which ball hits the floor first?
Both balls hit the floor at the same time
What causes a change in vertical velocity?
Acceleration due to gravity.
Put the number 0.0000000856 in scientific notation
8.56x10-8
3
If a car increases its velocity from 10 m/s to 60 m/s in 10 seconds, its acceleration is
5 m/s2
A girl drops a pebble from a high cliff into a lake far below. She sees the splash of the pebble hitting the water 2.00 s later.
What is the velocity of the pebble going when it hits the water?
What is the height of the cliff?
Velocity: -19.6 m/s
Height: 19.6m
A ball is projected horizontally from the edge of a table with a speed of 2.66 m/s, and it strikes the floor at a point 1.20 m from the base of the table. If the ball hits the ground after 0.60 seconds, what is the height of the table?
1.76 m
Solve the following problem and put into scientific notation, and display 3 significant figures:
72.875 x 23.98
1.75x103
Convert 20 centimeters to kilometers, then put in scientific notation
2x10-4km
The fastest fish, the sailfish, can swim 1.2 × 102 km/h. Suppose you have a friend who lives on an island 16 km away from the shore. If you send a message using a sailfish as a messenger, how long (in minutes) will it take for the message to reach your friend?
Answer: 7.8 min
A rock is tossed directly upwards at 3 m/s and falls down and land back in the hand of the thrower. Answer the following:
1. What is the velocity of the rock at the peak of its height?
2. What is the acceleration of the rock while in the are?
3. What is the speed of the rock when it lands back in the hand of the thrower?
1. 0 m/s
2. -9.8 m/s2
3. 3 m/s
The Royal Gorge Bridge in Colorado rises 321 m above the Arkansas River. Suppose you kick a rock horizontally off the bridge with an initial velocity of 5.56 m/s.
Find the time it takes for the rock to land in the Arkansas River.
8.09 seconds