An experimental rocket sled weighs 5230 Ib and is propelled by six rocket motors each with an impulse rating of 9100 lb-sec. The rockets are fired one after the other at 1.4-sec intervals, and the duration of each rocket firing is 3.0 sec. If the velocity of the sled 12.3 sec from the start is 201 mi/hr, determine the time average R of the total aerodynamic and mechanical resistance to motion. Neglect the loss of mass due to exhausted fuel compared with the mass of the sled. Rocket thrust Answer: R Ib

An experimental rocket sled weighs 5230 Ib and is propelled by six rocket motors each with an impulse rating of 9100 lb-sec. The rockets are fired one after the other at 1.4-sec intervals, and the duration of each rocket firing is 3.0 sec. If the velocity of the sled 12.3 sec from the start is 201 mi/hr, determine the time average R of the total aerodynamic and mechanical resistance to motion. Neglect the loss of mass due to exhausted fuel compared with the mass of the sled. Rocket thrust Answer: R Ib

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Q23. As shown in the image below, the force acting on the 5-kg crate is a function of time. The coefficient of kinetic friction between the crate and the surface is uk= 0.14. Determine the crate's speed at t= 2.1 s if its initial speed v1 = 2.9 m/s. Please pay attention: the numbers may change since they are randomized. Your answer must include 2 places after the decimal point, and proper Sl unit. Take g = 9.81 m/s2. F = (201² +30)N (t in second) F. 30 V1 Your Answer: Answer units
The 20-kg sphere C is released from rest when 0 = 0° and the tension in the spring is F = 100 N. (Figure 1) Figure 0.4 m E To 0.3 m k = 500 N/m D B 0.15 m C 1 of 1 Part A Determine the speed of the sphere at the instant = 90°. Neglect the mass of rod AB and the size of the sphere. Express your answer to three significant figures and include the appropriate units. V = Value Submit μÃ Provide Feedback Request Answer Units ? Next >
A rocket fired vertically up from the north pole achieves a velocity of 25 000 km/h at an altitude of 339 km when its fuel is exhausted. Calculate the additional vertical height h reached by the rocket before it starts its descent back to the earth. The coasting phase of its flight occurs above the atmosphere. Consult Fig. 1/1 in choosing the appropriate value of gravitational acceleration and use the mean radius of the earth from Table D/2. (Note: Launching from the earth's pole avoids considering the effect of the earth's rotation.) Answer: h= i km
Dynamic Lecture: The 2 kg BC ring can only move left and right on the frictionless rigid arm. Ring BC is connected to springs with spring constants k = 300 N / m and k ′ = 200 N / m at points AB and CD. The unstretched length of both springs is 600 mm. Since it is known that the springs are not tensioned and starts from rest, find the velocity of the ring BC at the moment when the external force F is applied 200 mm.
A rocketship has 9 modules each with a mass of 15 200 kg and moves at a speed of 7.0 km/s. One of the modules is explosively propelled away from the rocketship at a speed of 1350 km/h with respect to the rocketship, opposite in direction from the original travel direction of the rocket ship.What is the resulting change in the speed of the rocketship?
i need help with this question please. thank you
An experimental rocket sled weighs 5910 lb and is propelled by six rocket motors each with an impulse rating of 8120 Ib-sec. The rockets are fired one after the other at 1.2-sec intervals, and the duration of each rocket firing is 2.9 sec. If the velocity of the sled 11.8 sec from the start is 165 mi/hr, determine the time average R of the total aerodynamic and mechanical resistance to motion. Neglect the loss of mass due to exhausted fuel compared with the mass of the sled. Rocket thrust Answer: R = i Ib
A hockey puck of mass 162 grams slides toward Brett with a velocity of -15 meters per second. Brett whacks the puck directly away from himself with his stick, applying force as shown on the graph below. His maximum force is 33 newtons, and each tic mark on the time axis represents 1/10th of a second. What is the final velocity of the puck? Include units in your answer. More information.
Q15. As shown in the image below, the 17-kg crate is being hoisted by the motor. If at this instant shown the velocity of point P on the cable is vp = 2.6 m/s and the speed is increasing at 1.3 m/s², what is the power input supplied to the motor if its efficiency is e = 0.63? Please pay attention: the numbers may change since they are randomized. Your answer must include 1 place after the decimal point, and proper Sl unit. Take g = 9.81 m/s². Vp Your Answer: P Answer D A units
Don't Use Chat GPT Will Upvote
A 15 -kg collar travels down a smooth slope which is described by the function: y = 0.1 x2 as shown. If at location 1 its speed is 15 m/s, determine its speed when it gets to position 2, The spring has original length (unstretched length) = 7 m and stiffness k=60 N/m. Note: you must use Principle of Work and Energy y = 0.1 x? 1 2 6 т + 10 m
A 10 kg block A rests on a smooth surface and the spring is compressed 0.1 m. It is attached to an inextensible cord over frictionless, weightless pulleys with a mass B of kg, as shown. If the system is released from rest and B travels 0.1 m, what is A's speed? Consider K = 490N/m (spring) and V₁ = 2 x VB