This Quiz have Tecnology problems.The level os this poblems is easy, but you have to now some formulas. If you are ready, we can start!!!
Q 1 - The force of a dog is 400 N and it has an acceleration of 2 m/s^2. What mass it has? (F=m*a)
F= m*a m=F/a m= 400 / 2= 200 kg
Q 2 - One car has traveled 50 m in 10s. At what speed it traveled? (X=v*t) .
X= v*t V=x/t V= 50 / 10 = 5 m/s
Q 3 On book have a mass of 3 kg. What weight it has? (P= m*g) (g= 9,8 m/s^2)
P= m*g P= 3*9,8= 29,4 N
Q 4 - One lorry is travelig with a velocity of 5 m/s and it mass is 100 kg. What kinetic energy has it? (Ec= 1*m*v^2/2)
Ec= 1*m*v^2/2 Ec= 1*100*5^2/2= 1250 J
Q 5 -One swimmer with a mass of 60 kg is going to jump in a trampoline that has a height of 10 m. What potential energy he has? (Ep= m*g*h) (g= 9,8 m/s^2)
Ep= m*g*h Ep= 60*9,8*10= 5880 J
Q 6 - One motorbike has a potency of 11 KW. What work it has in 10 s? (1 KW= 1000W)(P= W/t)
P= W/T W= P*T W= 11000*10= 110000 W
1 CV is 735 W
Q 8 -One engine supplies an electric potency of 30 KW in 7 h. What electric energy it has? (Eel = Pel*t)
Eel = Pel*t Eel= 30*7= 210 Kw/h
Q 9 - In one factory there are two electrics motors with an efficiency of 80% and 40%. What is the total efficancy?
% total= 40*80= 3200/100= 32%
Q 10 - One car consumes 6 litres in 100 km and the benzine has a density of 50 kg/l. What consumption it has in kg/km?
C total= 6*50/100= 3kg/km