-20 m/s 20 m
20 mld
604
45
30
1 kg
1 kg
1 kg
D
E
F
y - 23.1 m's
- 40 m's
- 28.3 m's
- 20 ms
, - 20 m
- 20 m
450
30
2 kg
2 kg
2 ke
Which of the following statements are true about the situations depicted in the figures above?
The highest vertical helght reached is in pictures B and E
OA: True B: False
At the top, the vertical velocity of the cannonball is zero
A: True OB: False
The longest horizontal distance traveled is in pictures B and E
A: True B: False
The time in the air
is greater in A and D than it is in C and F
A: True OB: False
The flight of the ball is identical in pictures C and F, Independent of the fact that the masses are dife
OA: True B: False

Aroll in a paper machine is powered by a separately excited dc machine. operating point 1 (under load): the roll typically operates at 764 rpm and must provide 301 nm of torque to oppose the load of the paper. the armature voltage is 230v for this operating point operating point 2 (no load): when the load is removed the speed of the roll increases to 900 rpm (the field characteristics are unchanged) la ea dev m (a) calculate the maximum torque (units of nm) that the motor can supply with this applied voltage (b) calculate the value of the armature resistance, ra (in ohms) (c) at operating point 1 (loaded condition), the field current, i, and the total input power (armature field), are measured to be to be 10 a and 28,600 w respectively. use this information to calculate the value of the field resistance, rf (in ohms). (d) (d) at operating point 1 (loaded condition), calculate the motor efficiency. express your answer as a percent to at least 2 significant digits. (d) if the field voltage is reduced by 1/2, calculate the new stall torque (in nm) of the motor (f). if the field voltage is reduced by 1/2, calculate the new no-load speed (in rad/sec)

The law of conservation of energy states that energy cannot be created or , energy can be from one substance to another. the first blank is ' destroyed ' and for the second blank is ' transferred '

Um vetor representa um deslocamento cujo módulo é 20 m. se v faz um ângulo de 60 graus com a horizontal, qual é o valor das componentes horizontal e vertical deste vetor?