Bernie, whose mass is 70.0 kg, leaves a ski jump with a velocity of 21.0 m/s. what is bernie’s momentum (kg*m/s) as he leaves the ski jump?

Momentum = mass * velocity
Momentum = 70 * 21
Momentum = 1,470

Therefore, Bernie’s momentum was 1,470kg*m/s as he leaves the ski jump. :)

Pe = 1/2k(x)^2  and .05n/m = .05x10^-9m = x 

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.