PH 220 Week-1 to 3 Assignments + Midterm Exam - Grantham University
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PH220 Assignments: Week-1 assignment; Introduction, Measurement, Estimating One lightyear is defined to be the distance light can travel in one year. • What is this distance in meters? • How long does it take for light to get to the Moon 1. Multiply 1.783 x 102 * 4.4 x 10-3, taking into account significant figures. 2. What is the surface area of a sphere of diameter 2.4 x10 2 cm? 3. What is larger 4000 L or 4 x 105 cm3 and you must show your reasoning. 4. A car travels 120 meters in one direction in 20 seconds. Then the car returns ¾ of the way back in 10 seconds. • Calculate the average speed of the car for the first part of the trip. • Find the average velocity of the car. 1.
A sports car moving at constant speed travels 150 m in 4.00 s. If it then brakes and comes to a stop while decelerating at a rate of 6.0 m/s 2. How long does it take to stop? 2. Explain a possible situation where you start with a positive velocity that decreases to a negative increasing velocity while there is a constant negative acceleration. 3. A stone is dropped from the roof of a high building. A second stone is dropped 1.25 s later. How long does it take for the stones to be 25.0 meters apart? 1.
Week-2 assignment; Kinematics in Two Dimensions; Vectors and Dynamics: Newton's Laws of Motion A ship has a top speed of 3.0 m/s in calm water. The current of the ocean tends to push the boat at 2.0 m/s on a bearing of due South. What will be the net velocity of the ship if the captain points his ship on a bearing of 55° North or West and applies full power? 2. An airplane is 50,000 m above an observer and 2.1 km to the west of them and 1.5 km to the north of you. Determine the angle to the plane in the x – y axis and the total distance to the plane from you. Choose the xaxis east, y axis north, and z axis up. 3. A bullet is fired from at a shooting range. The bullet hits the ground after 0.32 seconds. How far did it travel horizontally and vertically in this time if it was fired at a velocity of 1100 m/s? 4. A not so brilliant physics students wants to jump from their 3rd floor apartment window to the swimming pool below. The problem is the base of the apartment is 8.00 meters from the pool’s edge. If the window is 20.0 meters high, how fast does the student have to be running horizontally to make sure they make it to the pool’s edge? 1.
If a 1500 kg car stopped from an in 5.6 seconds with an applied force of 5000 N, how fast was it initially traveling? 6. If the acceleration due to gravity on the Moon is 1/6 that what is on the Earth, what would a 100 kg man weight on the Moon? If a person tried to simulate this gravity in an elevator, how fast would it have to accelerate and in which direction? 7. A 7.93 kg box is pulled along a horizontal surface by a force F_P of 84.0 N applied at a 47.0o angle. If the coefficient of kinetic friction is 0.35, what is the acceleration of the box? 8. If a car is traveling at 50 m/s and then stops over 300 meters (while sliding), what is the coefficient of kinetic friction between the tires of the car and the road? 5.
Week-3 assignment; Circular Motion, Gravitation, and Work and Energy A 5600 kg mass car is taking a turn at 72 m/s. If the frictional force here is 44,000N, what is the radius of curvature of the turn? 2. Up where the ISS (International Space Station) orbits at 387 km, even though they are weightless there still is an acceleration due to gravity. Calculate its value and what it is in respect to 8g at the Earth’s surface. 3. Going back to the previous question, how long does it take the ISS to orbit? (You must calculate this and not just look it up!) 4. If a person on a 35.0 m diameter Ferris wheel feels 30% heavier at the bottom of the wheel, how fast is it going around? 5. A large box with mass 45 kg is being pushed up a ramp at a 32o incline at a constant velocity by a man pushing parallel to the incline for 7.80 m. If the coefficient of kinetic friction is 0.25, what is: 1. The force the man is pushing on the box. 2. The work done by the man on the box. 3. The force of friction. 4. The work done by the friction force. 6. A spring with negligible mass is suspended next to a ruler such that the end of the spring at equilibrium is at the 0 cm mark on the ruler. If a 3.0 kg mass is suspended from the spring and it stretches so that the end of the spring is at the 17 cm mark, what is the spring constant k? 1.
A softball having a mass of 0.45 kg is pitched horizontally at spring with spring constant 78 N/m. If the ball hits the spring and compresses it 56 cm, how fast was the softball moving initially? 8. A roller coaster is a height of 120 m and has a series of dips. What is he velocity at the bottom (assuming this is 120 m below the top) and what is the velocity at a bump that is 75 m above the ground? 7.