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Homework 1 (PHYS 161)
General Physics I (PH 161)
Montgomery College
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Homework Wednesday, September 8, 2021 11:18 PM 1. During a 100 m sprint, the runner starts from rest and accelerates uniformly at the beginning of the race. She accelerates to speed of 10 and maintains that speed for the rest of the race. She completes the race in 11. (a) What the time interval that she maintains the constant 10 (b) What is the time DX2 acceleration constant interval that she was accelerating? (c) What was the value of her acceleration? (d) How far does she travel during the acceleration period? t, , DX2 AX 100m At 11 A. xx, Ax Vt2 The runner was accelerating for 2 seconds so if She ran a total of 11 seconds she at constant 10 for 9 seconds! seconds B. The runner was accelerating for 2 seconds, seconds 3. The graph shows the velocity of vehicle as function of time v(t) The time is in seconds and the velocity All motion occurs along straight line. (a) Determine the change of position for the vehicle from 0 to 5 s. (b) What is the acceleration of the vehicle at 2 seconds? 15 10 0 1234 5 (s) position velocity Acceleration m 3) An arrow fired straight up from bow. The arrow is in contact with the bow string through a distance that is approximately the length of the arrow The arrow travels upward about forty meters, and returns to hit the ground. When the arrow examined just little past the arrowhead buried into the ground. Describe the relative amplitude and direction of the accelerations during each part of the motion described above. 40 when the arrow is shot upward it has a increasing acceleration relative amplitude 40 when the arrow comes back down it has a decreasing acceleration when the arrow hits the ground the final velocity acceleration bothe become o zero the friction from the mud stops the arrow 21 km , 92 seconds 4) During the emergency escape test of the Dragon space capsule, the Falcon rocket was launched and its engines fired for 92 seconds At the end of that time the spacecraft was 21. km from the launch point. Assume all the motion occurs along line and that the acceleration of the rocket is constant (we will later talk about how to deal with the curved path). (a) What is the average speed of the rocket (b) What is the value of the speed at the 92 second mark? (c) What the acceleration of the rocket? At that point the escape rockets fired for the space capsule. They fired for 28 seconds At that time the capsule was 34 km from the launch point. (d) What was 11 11 the average speed of the capsule for that 28 second interval? (e) What the final speed at the end of the 28 second interval? A. s 11 First convert 21 km to m 21,900 m Launch point D. First convert 34 km to m 34400 B. x x x vot S 446 mls 21900 42324 E. 476 mls 34400 392 a C. 5 2 Homework Wednesday, September 8, 2021 11:18 PM 1. During a 100 m sprint, the runner starts from rest and accelerates uniformly at the beginning of the race. She accelerates to speed of 10 and maintains that speed for the rest of the race. She completes the race in 11. (a) What the time interval that she maintains the constant 10 (b) What is the time DX2 acceleration constant interval that she was accelerating? (c) What was the value of her acceleration? (d) How far does she travel during the acceleration period? t, , DX2 AX 100m At 11 A. xx, Ax Vt2 The runner was accelerating for 2 seconds so if She ran a total of 11 seconds she at constant 10 for 9 seconds! seconds B. The runner was accelerating for 2 seconds, seconds 3. The graph shows the velocity of vehicle as function of time v(t) The time is in seconds and the velocity All motion occurs along straight line. (a) Determine the change of position for the vehicle from 0 to 5 s. (b) What is the acceleration of the vehicle at 2 seconds? 15 10 0 1234 5 (s) position velocity Acceleration m 3) An arrow fired straight up from bow. The arrow is in contact with the bow string through a distance that is approximately the length of the arrow The arrow travels upward about forty meters, and returns to hit the ground. When the arrow examined just little past the arrowhead buried into the ground. Describe the relative amplitude and direction of the accelerations during each part of the motion described above. 40 when the arrow is shot upward it has a increasing acceleration relative amplitude 40 when the arrow comes back down it has a decreasing acceleration when the arrow hits the ground the final velocity acceleration bothe become o zero the friction from the mud stops the arrow 21 km , 92 seconds 4) During the emergency escape test of the Dragon space capsule, the Falcon rocket was launched and its engines fired for 92 seconds At the end of that time the spacecraft was 21. km from the launch point. Assume all the motion occurs along line and that the acceleration of the rocket is constant (we will later talk about how to deal with the curved path). (a) What is the average speed of the rocket (b) What is the value of the speed at the 92 second mark? (c) What the acceleration of the rocket? At that point the escape rockets fired for the space capsule. They fired for 28 seconds At that time the capsule was 34 km from the launch point. (d) What was 11 11 the average speed of the capsule for that 28 second interval? (e) What the final speed at the end of the 28 second interval? A. s 11 First convert 21 km to m 21,900 m Launch point D. First convert 34 km to m 34400 B. x x x vot S 446 mls 21900 42324 E. 476 mls 34400 392 a C. 5 2
Homework 1 (PHYS 161)
Course: General Physics I (PH 161)
University: Montgomery College
