bbwake

Based on the conservation of momentum, the velocity of launcher V=vo*m/M. The kinetic energy of launcher is E=1/2*M*V^2=1/2*m/M*m*vo^2. Suppose the coefficient of friction is C. The friction F=C*M*g. The launcher is stoped, then F*x=E,then C=1/2*m^2/M^2*v...

1. To balance the gravity of the 75N block, the pull force from the cable applied on it should be 75N. 2. Then the cable pulls the 150N block with a force of 75N. 3. To balance the pull force from the cable, the static friction should be 75N. 4. And the c...

To a wave, wavelength * frequency = velocity. The speed of light in vacuum = 2.99792458e8 m/s ¡Ö 3*10^8 m/s. (a) wavelength = velocity/frequency = 3*10^8/(3*10^19) = 10^-11 m. (b) wavelength = 3*10^8/(7.5*10^9) = 0.04 m.