{13.14} What is the magnitude of its angular momentum? Determine the force exerted by the rope on her arms?

A car of mass 1000kg moves with a speed of 50 m/s on a circular track of radius 100m. What is the magnitude of its angular momentum (in kg.m^2/s) relative to the center of the racetrack? ============================================== Answers: a) 5 x 10^2 b) 5 x 10^6 c) 2.5 x 10^6 d) 2.5 x 10^4 ############################ ...continues

(1.9) magnitude of vector, height of the arrow at a point 150 meters downrange

If A = (12i - 16j) and B = (-24i+10j), what is the magnitude of the vector C=(2A-B)? =================================================== Answers: a) 42 b) 22 c) 64 d) 90 ################################################### An archer shoots an arrow with a velocity of 45 m/s at an angle of 50 degrees with the horizontal. W ...continues

(3.10) angular accelleration of this wheel? Find tension in the string?

At t=0, a wheel rotating about a fixed axis at a constant angular acceleration has an angular velocity of 2 rad/s. Two seconds later it has turned 5 complete revolutions. What is the angular acceleration of this wheel? ============================================== Answer: a) 17 rad/s^2 b) 14 rad/s^2 c) 20 rad/s^2 d) 23 ra ...continues

coefficient of static friction

I'm doing an experiment of coefficient of static friction, and I don't understand it. I'm to place a coin at one edge of the textbook and slowly lift the book. just starts to slip down the incline. when this cccurs,measur the angle(0) I did this.next I'm suppose to fine Ff=m.g.sin0 and N=m.g.cos0. case1=Us for one coin and Case ...continues

A spring-loaded cannon

6.) A spring-loaded cannon aimed at 47 degrees above the horizontal is on the last car of a long train of flat cars. The train has an initial velocity of 54.3 km/h. At the moment the train begins to accelerate forward at 0.325 m/s2 , the cannon fires a projectile at 180 m/s. The cannon points in the direction that the train is m ...continues

I need this ASAP, show all work please!!!

5.) Three vectors have the same magnitude of 14 units. They make angles of θ, 2θ, 3θ with respect to the x axis, where θ = 20 degrees. What is their vector sum?

Acceleration, tension

4.) A 0.840 kg glider on a level air track is joined by strings to two hanging masses. The strings have negligible mass and pass over light, frictionless pulleys. a.) Find the acceleration of the masses and… b.) Find the tension in the strings when the air flow is turned off and the coefficient of friction between the glider ...continues

Optics, magnification, etc

Please help with 48, 56, 62, 72, 86 ONLY 48) What is the magnification of the object when the object is 35 cm from the lens (see attachment please)

I need this problem worked out completely. Show ALL work with ANSWER please!! ASAP

Please don't just send me a formula. I'm Paying you to give me the correct answer. Thank you. 1.) A horizontal force of 3.00 N is applied to a 1.00-kg radio, initially at rest on a table with a level surface. a.) Will the radio move if the coefficient of the friction is 0.45? b.) What is the coefficient of friction if it ...continues

I need this problem worked out completely. Show ALL work with ANSWER please!! ASAP

A 0.0050-kg bullet traveling with a speed of 200 m/s penetrates a large wooden fence post to a depth of 0.030 m. What was the average resisting force exerted on the bullet?