Terms to Know
What is the formal name for the set of standards that defines the units of measurement used principally in science?
Système International d'Unités
A boy throws the ball from an initial height of 1.70 m straight up to his friend in the treehouse. He throws the ball with an initial upward velocity of 14.5 m/s.
When does the ball reach the treehouse window (yf = 6.30 m)?
.36 s, 2.59 s
Accuracy is a measurement of…
How close to the accepted value a measurement is
Three concurrent forces act simultaneously on a wheel of cheese: F1 - 15.0 N at 25.0o north of east, F2 = 22.0 at 73.0o north of east, and F3 = 8.0 N at 5.0o west of south.
Find the net force.
27.4 N at 45.1o north of east
What is the difference between speed and velocity?
Speed is a scalar, while velocity is a vector
A 4.01 * 103 kg box is sitting on a concrete floor. A worker tries to push the box with a force of 4.2 *104 N. The coefficients of friction are μs= .193 and μk= .102.
Will the box move?
What is the acceleration of the box?
yes
9.48 m/s2
Which of the following forces holds together protons and neutrons in the nucleus?
Strong Nuclear Force
A test driver is approaching a level curve on the test track in a 1815 kg sports car. The curve has a radius of 50.0 m. The pavement is concrete ( μs= .100 and μk= .080). What is the maximum constant speed at which the car can negotiate the turn without skidding?
22.1 m/s
When a figure skater spins at the tip of his skate, what kind of motion is happening?
Rotational motion
A private aviation helicopter's main rotor blades rotate at approximately 475 rpm. The main rotor blades of the helicopter are 5.0 m long from drive hub to tip.
What is the angular speed of the blades?
What is the tangential speed of the blades at the blade tips?
49.7 rad/s
250 m/s