Related Questions

In a engineering, test, a rocket sled is propelled into a target. If the sled's distance d in meters from the target is given by the fomula d = - 1.5 t2+120, where t is the number of seconds after rocket ignition, then how many seconds have passed since rocket ignition when the sled is 10 meters from the target?
A 2.58
B 8.59
C 8.94
D 9.31
Read the following passage carefully and then choose the right word to complete the sentence that follows. Rockets are very expensive as it can be used only once. Appled scientists have therefore develped a reusable space craft called a space shuttle which takes off like a rocket; however, does no get destroyed as it returns to earth. It can also be used to lunch satellired into space, retrieve them from space if any repairing os required and allow around 8 scientists to crryout experiments in space. The space shuttle does not get.
A flattened
B enlarged
C ruined
D developed
The water in a jet propelled boat is drawn through the openings facing the direction of motion of the boat. The efficiency of propulsion is given by
A $$\frac{{2{\text{v}}}}{{{{\text{V}}_{\text{r}}} - {\text{v}}}}$$
B $$\frac{{2{\text{v}}}}{{{{\text{V}}_{\text{r}}} + {\text{v}}}}$$
C $$\frac{{\text{V}}}{{{{\text{V}}_{\text{r}}} - {\text{v}}}}$$
D $$\frac{{\text{V}}}{{{{\text{V}}_{\text{r}}} + {\text{v}}}}$$
Which of the following statement is correct relating to rocket engines?
A The combustion chamber in a rocket engine is directly analogous to the reservoir of a supersonic wind tunnel
B The stagnation conditions exist at the combustion chamber
C The exit velocities of exhaust gases are much higher than those in jet engine
D All of the above
The Diesel engines as compared to petrol engines require
A Bigger flywheel
B Smaller flywheel
C Same size of flywheel
D No flywheel
What is the minimum velocity required for a rocket to overcome earth's gravity and travel into space?
A 18 km\/sec
B 11.2 km\/sec
C 21 km\/sec
D 35 km\/sec
What is the minimum escape velocity of rocket to be launched into space ?
A 5 Km/Sec.
B 6 Km/Sec.
C 11 Km/Sec.
D 15 Km/Sec.
A rocket flying to the moon does not need wings because----
A it has no engine
B space has too much dust
C it has no fuel
D space is airless
A rocket flying to the moon dose not need wings because
A It has no engine
B Space has too much dust
C It has no fuel
D Space is airess
Fuel consumption of diesel engines is not guaranteed at one quarter load because at such low loads
A The friction is high
B The friction is unpredictable
C The small difference in cooling water temperature or in internal friction has a disproportionate effect
D The engine is rarely operated

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