8. The force that keeps the body moving in circular motion is a) Centripetal force b) Centrifugal force c) Force of gravity d) Reaction forces 9. A body of weight 20 N, mass 2 kg is moving in vertical circular motion with the help of a string of radius 1 m and with a velocity of 5 m/s. What is the tension in the string at the highest point? a) 30 N b) 50 N c) 20 N d) 25 N

8. The force that keeps the body moving in circular motion is a) Centripetal force b) Centrifugal force c) Force of gravity d) Reaction forces 9. A body of weight 20 N, mass 2 kg is moving in vertical circular motion with the help of a string of radius 1 m and with a velocity of 5 m/s. What is the tension in the string at the highest point? a) 30 N b) 50 N c) 20 N d) 25 N

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

4. Andrew, whose mass is 60 kg, spins a ball of mass 0,4 kg on a frictionless table top with a constant angular velocity of 5 rad/s. The length of the string r between Andrew's hand and the ball is 80 cm. What is the tension force in the string? a) 4 N b) 96 N c) 12.5 N d) 8 N
4. A soccer ball with a mass of 0.510kg is initially moving with a speed of 2m/s. A soccer player kicks the ball, exerting a constant force of magnitude 40N in the same direction as the ball's motion. Over what distance in meter must her foot be in contact with the ball to increase the ball's speed to 6m/s? a) 0.89 b) 0.168 c) 0.209 d) 0.705 e) 0.654
Fred pushes a 55 kg refrigerator with a force P = 100 N inclined at 30° from the horizontal at 1.60 m from the floor as shown in the diagram. The coefficient of static friction between the floor and the refrigerator is 0.40.1. Which among the choices shows the limiting value of the frictional force between the refrigerator and the floor?A) 90.9 NB) 195.8 NC) 108.8 ND) 490 N2. Is the refrigerator not moving, moving, or on the verge of moving? Prove this through calculations.3) Write the correct moment equilibrium equation about A for the refrigerator. (Just use P, don't use P =100)
6. A block is pushed up a frictionless 30° incline by an applied force as shown in the figure. If F = 25 N and M= 3.0 kg. What is the magnitude of the resulting acceleration of the block? a) 5.93 m/s? b) 4.82 m/s? c) 3.69 m/s? d) 2.31 m/s? e) 6.94 m/s? M F 30° 30°
The 15 kg collar is given a downward velocity of 4 m/s when it is at A. If the spring has an unstretched length of 1 m and a stiffness of (K = 30 N/m). 4 m/s 7) What is the velocity of the collar at s = 1? a) 13.3 m/s e) 2.8 m/s b) 4,2 m/s f) 17.5 m/s c) 15.3 m/s g) None of them www d) 6.8 m/s
54. A man is marooned at rest on level frictionless ice. In desperation, he hurls his shoe to the right at 15 m/s. If the man weighs 720N and the shoe weighs 4.0 N, the man moves to the left at approximately: A) B) C) 2.1 x 10- m/s 8.3 x 10- m/s 15 m/s 2.7 x 10-° m/s E)
An 8 kg and a 2 kg block are attached to a pulley system as shown in the picture and a force is being applied to the left. If the 2 kg block is accelerating upward at 1.2 m/s2 , what is the force used to pull the blocks? There is no friction between the 8 kg block and the surface its moving across and you can assume the rope is massless and the pulley is massless and frictionless. a) 78.4 N b) 19.6 N c) 31.6 N d) 98.0 N
18. The airplane shown is in level flight at an altitude of 355 m and a speed of 85.0 m/s. At 85.0 m/s what distance D from the island should it release a supply package so that the people stranded on the island can survive? A) 723 m B) 638 m C) 1770 m D) 355 m E) 511 m 355 m
The 15 kg collar is given a downward velocity of 4 m/s when it is at A. If the spring has an unstretched length of 1 m and a stiffness of (K = 30 N/m). 4 m/s 7) What is the velocity of the collar at s = 1? a) 13.3 m/s e) 2.8 m/s b) 4.2 m/s f) 17.5 m/s c) 15.3 m/s 30 N/m d) 6.8 m/s ww g) None of them
The 15 kg collar is given a downward velocity of 4 m/s when it is at A. If the spring has an unstretched length of 1 m and a stiffness of (K = 30 N/m). 4 m/s| 7) What is the velocity of the collar at s = 1? a) 13.3 m/s e) 2.8 m/s b) 4.2 m/s f) 17.5 m/s c) 15.3 m/s g) None of them d) 6.8 m/s k = 30 N/m www.k
1. How many unknown support reactions are there in this problem? 40 Ib/ft A) Two forces and two couple moments B) One force and two couple moments C) Three forces D) Three forces and one couple moment 30 4 ft 3ft 2. A general system of forces and couple moments acting on a rigid body can be reduced to a A) single force B) single moment C) single force and two moments D) single force and a single moment 3. The three scalar equations . Σ Fκ-ΣFvΣ Μo-0 , are equations of equilibrium in two dimensions. A) Incorrect B) The only correet C) The most used D) Not sufficient
A cylinder of radius R = 2 (m) can freely rotate around its axis. The force F = 20t – 5t? (N) applied tangentially to the lateral surface of the cylinder changes with time. The cylinder is initially at rest and its moment of inertia is 15 (kg.m?). How many cycles does the cylinder make before it starts rotating in the opposite direction? Take -3. A) 3 В) 4 C) 5 D) 6 E) 8