PHY101- Exam 1 Q&A
Molly and Paul have a total weight of 1300 N. The tensions in the supporting ropes that support the scaffold add to 1700 N. The weight of the scaffold itself must be...
400 N
What is the acceleration of a car that states from rest and 5 seconds later reaches a speed of 20 m/s?
5 m/s^2
A 10-N falling object encounters 4 N of air resistance. The net force on the object is _____
6-N
When Molly and Paul stand on opposite ends of a sign-painting scaffold, the tension in the supporting ropes...
Depend on the relative weight of Molly and Paul
The technique of measuring volume of an irregular object is called ___________.
Displacement Method
Science later greatly advanced when Galileo favored ________________________.
Experiment over philosophical discussions
T/F: A Time internal is a scalar quantity
FALSE
T/F: Acceleration can never be negative
FALSE
T/F: Scalar measurements have both magnitude and direction
FALSE
Free fall motion is one in which _____ is the only force acting
GRAVITY
The first scientist to introduce the concept of inertia was
Galileo
If you toss a coin straight upward in a train that slows while the coin is in the air, the coin will land...
In front of you
If your automobile runs out of fuel while driving, the engine stops, you don't come to an abrupt stop due to ________.
Inertia
Which concept is being illustrated when a table cloth is quickly yanked beneath dishes resting on a table?
Inertia
The most basic of the sciences is physics, chemistry, and biology is ________
Physics
_________ is how well a number of independent measurements agree with one another.
Precision
The accelerations possible for a ball on an inclined plane ...
Range from zero to g
Galileo's use of inclined planes allowed him to effectively...
Slow down the balls changes in speed
The statement "there are regions beneath Earth's crust that will always be beyond the reach of scientific investigation is a __________
Speculation
When no forces act on moving objects, their paths are normally ______________.
Straight lines
Tension is actually a force that tends to _____________.
Stretch something
T/F: As the speed of an object falling through air increases, the magnitude of the drag force increases
TRUE
T/F: The net force on an object is the resultant of the force vectors
TRUE
An 800 N man stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale is...
400 N
The average speed of a horse that gallops 20 kilometers in 30 minutes is ...
40 km/h
A block pulled to the left with 15N and to the right with 5N at the same time experiences a net force of _______
10N
Jogging Jake runes at 4 m/s along a train flatcar that moves at 10 m/s in the same direction. Jake's speed relative to the ground is ...
14 m/s
The total time it takes a projectile fired straight up at 10 m/s to reach the top of its path and return to its starting point is about ...
2 s
When a pair of 10N forces act on a box of candy, the net forces on the box is .......
- 20 N - Zero - about 14 N ****any depending on the direction of forces
The acceleration of an object after it attains terminal speed is ___ m/s
0
If you toss a coin straight upward while in a train moving at constant velocity, the coin will land...
As if you were at rest
Earth continually moves about 30 km/s through space, which means the wall you stand next to also is moving at 30 km/s. When you jump vertically the wall doesn't slam into you because..
You're moving horizontally just as fast as the wall.
If an object moves with constant acceleration, its velocity must ...
change by the same amount each second
The scientific method is most effective in ...
gaining, organizing, and applying new knowledge
When Isaac Newton hangs at rest in the middle of a clothesline, tensions will. Be the same in each side of the rope when...
the angle for both sides of the rope are equal