05 Feb 07 Ballet Dancer Vector

Ballet Dancer Vector

Please help me to several questions of physics.?

I have problems with some of my questions of physics. I did my best. I do not understand the two questions below. Both films deal with vectors and forces. 1.) Alexa, the ballet dancer, has a mass of 45.0 kg. A. What is the weight of Felicia on earth? B. What is the mass of Jupiter Felicia, where the acceleration of gravity is 25.0 m / s ^ 2? c. What is the weight of Felicia on Jupiter? 2.) A man of 55 kg is accelerated upwards in an elevator. A. How heavy is human? b. The man feels like if she weighs 620 N. Draw a free body diagram of forces in the man. (No need to draw one. But please tell me how the forces are question. Two? Four?) C. What is the magnitude and direction of the net force on the man? D. What is the magnitude of the acceleration of human in the elevator? Please include an explanation, if possible. Thank you! Excuse the typo in # 1. "Alexa" is supposed to be "Felicia!"

1) the acceleration of the earth is about 10 m / s ^ 2 right? Weight is the force that pulls Felipe Earth. According Newton's second law F = ma right? In this case, Earth Weight = mass * acceleration Felicia on Earth a. Felicia weight = 45 * 10N = 450N When we provided our mass (the amount of stuff we have) never changes. Thus, even in the mass of Jupiter is Felicia b. 45 kg. c. However, its weight (force) = acceleration Jupiter * 45 kg = 25N = 45 * 1125N 2) a. So, as mentioned above weight = 55 * 10N = 550N b. There are essentially two forces in man. One is its weight on the floor of its center of gravity. and the other is the leg strength of the base of the elevator. c. The man is caught by the net force. Force Net worth is the sum of real forces (in this case, the remaining forces are at different addresses.) Force = 70N = 620-550 d. F = ma 70 = 55 * a = 70 / 55 ^ M / S 2

Rhythm’s Frestyledance ” Promo” from ROSEMAN Ent. Visual dance recording artistry