What is the quark structure of an electron?

a. uud
b. udd
c. uuu
d. ddd
e. the question does not make sense


E

Physics & Space Science

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A car is traveling at 30.0 m/s when the driver suddenly applies the brakes, giving the car a constant deceleration

The car comes to a stop in a distance of 120.0 m. What was the deceleration of the car? A) 3.75 m/s2 B) 4.00 m/s2 C) 4.25 m/s2 D) 4.50 m/s2 E) 4.75 m/s2

Physics & Space Science

The kinetic energy of a pendulum is greatest

a. when its potential energy is greatest. b. at the top of its swing. c. at the bottom of its swing. d. when its total energy is greatest.

Physics & Space Science

A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15-N force acting 20° above the horizontal. How much work is done by this force as the object moves 6.0 m?

a. 78 J b. 82 J c. 85 J d. 74 J e. 43 J

Physics & Space Science

Nine bulk silicon carbide specimens of the same size were tested and the following strengths were obtained: 22, 26, 33, 50, 29, 56, 58, 41, and 43 MPa.

(a) Plot these data to evaluate the characteristic strength and the Weibull modulus. (b) What is the stress for a 90 % probability of survival for this material?

Physics & Space Science