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QUESTION 1 4 points Save Answer How many significant figures are in the number 0.0034 O2 O 3 O4 05 QUESTION 2 4 points Save Answer Which of the following is a scalar? O Distance O Displacement O Velocity O Acceleration QUESTION 3 4 points Save Answer If I go out for a jog at a constant speed of 3 meters per second for 12 minutes, what was my acceleration? O 0 m/s2 3 m/s2 1/4 m/s2 O 1/240 m/s2 QUESTION 4 4 points Save Answer While going for your first step onto the moon, you accidentally knock a pencil and a spare oxygen canister (weighing 40 pounds) out of the lunar lander. Assuming they start from the same height, which object lands on the surface of the moon first? The pencil The oxygen canister O Both O Not enough information to tell QUESTION 5 You pull a 6-meter length of rope from the top of a flag pole out so that the end in your hand touches the pole’s shadow on the ground. You also note that the angle measured from the shadow on the floor up to the rope in your hand is 20 degrees. Which of the following expressions describes the height of the flag pole? O sin(20) O 6 / sin(20) 6cos(20) O tan(20) QUESTION 6 I’ve decided to travel the world. Leaving from Boston, I travel 5,374 miles to Buenos Aires, Argentina, then 10,459 km to Barcelona, Spain. From there, I travel 2,101,000 m to Copenhagen, Denmark and then head 9,042 km to Okinawa, Japan. Finally, I take a 7,545 mile flight back to Boston. What was my total displacement? (*Note: 1 km = 0.62 miles) O O km O 8,683 km O 34,521 km O 42.439 km QUESTION 7 What changes when I take an object from Earth’s surface out to space? It’s mass decreases as we leave the gravitational pull of the earth. The object’s density is going to increase as the object expands once we make it into space. O The object’s weight will disappear once we make it into space. The object’s weight and mass will become the same. QUESTIONS get it to move? As I shove a fridge across the floor, what force do I need to overcome O Static frictional force. O Kinetic frictional force O Normal force. O Force due to gravity. QUESTION 9 The Sun is 333,000 times the mass of the Earth and is 110 times larger than the Earth. It exerts an extremely powerful gravitational pull on the Earth, as well as every other planet in our solar system. Why doesn’t the Earth (along with every other planet) just fall directly into the Sun? The Earth is far enough away that gravity is too weak to do something like that. Earth’s radial acceleration is large enough to keep itself in orbit. The Earth is large enough that the Sun’s centripetal acceleration doesn’t effect it strongly enough. O Gravity can’t travel through space. QUESTION 10 Changing which of the following would NOT help me avoid skidding out when making a sharp turn on an icy road? Adding weights (mass) O Slowing down (speed) Reducing sharpness of turn (radius of curvature) O Better shocks (spring constant k) QUESTION 11 Newton’s First Law states that, for every action there is an equal and opposite reaction. True O False QUESTION 12 When an object undergoing projectile motion, reaches the peak of its arc, the velocity vector in the y-direction is zero. O True O False QUESTION 13 If I double the mass of an object sliding across (frictionless) ice, I would be doubling its normal force. O True False QUESTION 14 Although you can have a velocity with zero acceleration, you cannot have an acceleration with zero velocity. O True O False QUESTION 15 An astronaut on the ISS is an additional height above the Earth’s surface equal to the radius of the Earth. Because of this, the force that astronaut feels due to gravity is halved – compared to what they would have felt standing on the Earth’s surface. True O False QUESTION 16 Please complete only TWO of the following Open Response questions. Each of the two will be worth 20 points. Don’t forget to upload a file of your work for these questions for credit You’re driving down the highway at a constant speed of 110 km/h, when you see the car in front of you hit the brakes. You immediately start braking. A) Calculate your acceleration if you travel 117 meters before coming to a stop. (10 points) B) How long does it take you to come to that stop. (10 points) Attach File Browse Local Files Browse Content Collection Browse Dropbox QUESTION 17 Please complete only TWO of the following Open Response questions. Each of the two will be worth 20 points. Don’t forget to upload a file of your work for these questions for credit. Skydivers are jumping out of a plane one at a time. If the plane is 185 meters in the air, traveling horizontally at a speed of 62.5 m/s. A) How long will it take for the skydivers to land (ignoring air resistance). (12 points) B) How far away in the horizontal direction) should the skydivers be when they jump out, in order to hit their target landing site. (8 points) Attach File Browse Local Files Browse Content Collection Browse Dropbox QUESTION 18 Please complete only TWO of the following Open Response questions. Each of the two will be worth 20 points. Don’t forget to upload a file of your work for these questions for credit. Superman is working out by pushing around a 3-story building on flat ground. He exerts an initial force of 60,000 N on the 5,100 kg building. A) What is the coefficient of static friction between the building and the ground. (8 points) B) Superman continues to apply the 60,000 N force, accelerating the building at 4.70 m/s2. What is the coefficient of kinetic friction (12 points) Attach File Browse Local Files Browse Content Collection Browse Dropbox

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