Cho một con lắc đơn đang DĐĐH với chu kỳ T  2,5s , tại nơi có gia tốc trọng trường g  10   2 (m / s2 ) .
a.) Tính chiều dài của con lắc?
b) Để khi chiều dài con lắc tăng gấp đôi, tính tần số dao động của con lắc?

Determine the change in width a, height b, thickness t when a plate is subjected to the uniform distributed load and is made of material having modulus of elasticity e=230 gpa and poisson's ratio ν=1/3. given : a=400 mm and b= 300 mm also the uniformly distributed load in downward y direction of plate is 2 mn/m and in the positive x direction is 3 mn/m and t=20 mm

Convection occurs when thermal energy is transferred by the movement of

A1500 w electric heater is plugged into the outlet of a 120 v circuit that has a 20 a circuit breaker. you plug an electric hair dryer into the same outlet. the hair dryer has power settings of 600 w, 900 w , 1200 w, and 1500 w. you start with the hair dryer on the 600 w setting and increase the power setting until the circuit breaker trips. under what setting does the circuit breaker trip.