1. Scientists seek to acquire knowledge and understanding of the real world through the formulation, testing, and evaluation of what?
A) deductive reasoning
B) scientific theory <--- answer.
C) scientific method
D) technology
2. A scale measures the weight of a light object to be 11.000 lbs ± 0.034 lbs. What is the uncertainty if this same scale is used to measure an object that weighs 78.000 lbs? Assume that the percent uncertainty of the scale remains constant.
A) 0.310 lbs
B) 0.034 lbs
C) 0.240 lbs <--- answer??
D) 0.044 lbs
3. What does the process of scientific inquiry start with?
A. It starts with a checklist of procedures used or materials needed.
B. It starts with an observation using one of the five senses. <- answer
C. It starts with a problem to solve or a question to answer.
D. It starts with a test performed by researchers in a laboratory.
4. A mouse in a maze scurries 41 cm south and then takes a 90-degree turn and scurries 64 cm west to get a piece of cheese. Find the mouse's displacement.
A) southwest
B) 105 cm
C) zero
D) 76 cm southwest <- answer
5. When might an object's average velocity be equal to its average speed in two dimensions?
A) The object's average velocity will never be equal to its average speed, in magnitude or direction, because average velocity will be negative and average speed will be positive
B) If the object moves in a straight line in one direction represented as positive, then the direction and magnitude of the average velocity will be equal to the average speed.
C) If the object does not loop back to its starting position, then the average velocity will be equal to the average speed.
D) If the object moves in a straight line in one direction represented as positive, then the magnitude of average velocity will be equal to the average speed. (ANSWER)
7. What is the range of a bullet fired horizontally at a height of 1.5 m with an initial velocity of 120 m/s?
A) -9.8 m/s^2
B) ~ 0.55s
C) ~ 66.4 cm (ANSWER)
D) There is not enough information to find the range of the bullet.
8. What two vertical forces act on a falling leaf?
A) pull, friction
B) weight, friction
C) weight, push
D) weight, pull (ANSWER?)
9. What is equal and opposite to the applied force on a spring?
A) displacement (ANSWER)
B) spring constant
C) spring force
D) equilibrium
12. How does the force of impact during a collision change when the time of contact is reduced?
A) It remains the same
B) It increases
C) It decreases (ANSWER)
D) It instantaneously becomes zero
13. The threads of a screw used to fasten two pieces of wood are pitched at an angle. How does this increase the static friction force?
A) By increasing the normal force exerted by the wood on the screw thread
(ANSWER ^^)
B) By increasing the surface area between the screw surface and the wood
C) By increasing the coefficient of static friction between the screw and the wood
D) By increasing the ease of inserting the screw into the wood
14. A 60 kg skier with an initial velocity of 12 m/s coasts up a hill. At the top of the hill, the skier is traveling at 9.75 m/s. Assuming there is no friction in the skis, how high was the hill?
A) 7.35m (ANSWER?)
B) 0.25m
C) 2.5 m
D) 10m
17. What is true about weather?
A) The weather behaves randomly, which is why weather predictions are so often inaccurate. <- (ANSWER?)
B) Accuracy increases the farther you are from the day’s weather you are predicting.
C) Weather can be predicted dependably by computational models.
D) The weather depends on so many conditions that it is not possible to account for them all in any model.
24. Object A and Object B are at equal distances on opposite sides of Object C. Object B has three times the mass of Object C. Objects A and B have equal mass. What is the ratio of the gravitational force between Objects A and B to the gravitational force between Objects B and C?
A) 3/2
B) 2 <- answer???
C) 3/4
D) 3
25. A geosynchronous satellite has an orbital period of 24 hours so that it stays fixed at a point above Earth’s surface. How far away does a geosynchronous satellite need to be from the surface of Earth, in kilometers?
A) 42,300 km
B) 29,500 km <- answer?
C) 35,900 km
D) can be any distance
26. Calculate the eccentricity for the planet if the distance between foci is 5,000,000 km and the distance of the major axis is 299,000,000 km.
A) 0.598
B) 59.8 (answer??)
C) 0.167
D) 0.0167
27. A planet travels in its orbit close to apogee, and in 2 years, its radius vector sweeps out an area of 3 A. How long will it take the planet’s radius vector to sweep an area of 3 A when it is close to perigee?
A) a larger time because the planet’s orbital speed will increase
B) a smaller time because the planet’s orbital speed will increase
C) a smaller time because the planet’s orbital speed will decrease
D) the same amount of time (answer??)
28. If astronomers discovered a new planet and found its period of rotation around the Sun to be 105 years, how long would its semi-major axis length be as it orbited the Sun in AU?
A) 105 AU
B) 22.3 AU (Answer)
C) 4.7 AU
D) 1.84 AU
1 answer
1 answer