A lunar lander is making its descent to Moon Base I. The lander descends slowly under the retro-thrust of its descent engine. The engine is cut off when the lander is h = 6.0 m above the surface and has a downward speed of 0.6 m/s. With the engine off, the lander is in free fall. What is the speed of the lander just before it touches the surface? The acceleration due to gravity on the moon is 1.6 m/s2. m/s

Which machine should you choose : If the company plans to replace the machine when it wears out on a perpetual basis, which machine should you choose? |

What is highest freq input signal that will not be aliased : suppose that A/D-H(z)-D/A system shown uses a sampling rate of 20000 samples/sec , let xa(t)=10cos (2p*500t)u(t) a- give another input signal x1(t) which gives the same samples x(n) b- give another input signal x2(t) |

Conduct a hypothesis test to determine if the proportion of : Conduct a hypothesis test to determine if the proportion of business students atBayview University who were involved in some form of cheating is less than thatof nonbusiness students at other institutions as reported by the Chronicle of HigherEducati.. |

Explain a first order decomposition reaction has a half-life : A first order decomposition reaction has a half-life of 60yr. What percentage of the original amount is left after 164years. (give answer to 3 sig figs using E notation) |

What is the speed of the lander : A lunar lander is making its descent to Moon Base I. The lander descends slowly under the retro-thrust of its descent engine. What is the speed of the lander |

What alternatives that help reconcile needs and resources : a. Is their retirement plan achievable as is? b. If not, what are the alternatives that could help reconcile needs and resources? c. What is your recommendation? |

Determine how many cows you want : Determine how many cows you want, determine how much land is necessary and where you want the cows to graze. Draw the dimensions on the grid. |

What was the launch angle : A certain projectile is launched with an initial speed v0. At its highest point its speed is v0 / 4. What was the launch angle |

Design a dsb-sc modulator to generate a modulated signal : design a DSB-SC modulator to generate a modulated signal km(t)cosωct with the carrier frequency fc = 500kHz (ωc = 2π x 500,000). The following equipment is available in the stockroom: (i) a signal generator of frequency 100 kHz; (ii) a ring modula.. |

## What is the final velocity of the planeA missile of mass 1.20 102 kg is fired from a plane of mass 4.85 103 kg initially moving at a speed of 3.35 102 m/s. what is the final velocity of the plane? |

## What is the angular frequency in of the combinationA uniform disk turns at 4.3 around a frictionless spindle. A nonrotating rod, of the same mass as the disk and length equal to the disk's diameter, is dropped onto the freely spinning disk. |

## What is the mechanical energy degenerate by various forcesA 40kg child on a 2.30 m long swing is released from rest when the swing supports make an angle of 26 degrees with the vertical. The acceleration of gravity is 9.8 m/s2. |

## What is the balls diameterYou stand with your nose 5.0cm from the surface of a reflecting ball, and your nose's image appears three-quarters full size. What is the balls diameter? |

## How long does the projectile remain in the airA projectile is fired horizontally from a gun that is 88-m above flat ground, emerging from the gun with a speed of 250m/s. |

## At what speed did his pool shot hit the groundThe winner of the competition wants to know if he has broken the world record for the break shot of 32mph (about 14.3m/s). The ball landed a distance 5.15m away from the table edge, calculate his break shot speed. At what speed did his pool shot h.. |

## Determine the potential energy of this systemThree charges are at rest on the z axis: q1 = ?6.41 mC at z = 3.60 m, q2 = ?1.20 mC at z = 0 m, What is the potential energy of this system |

## Which received most of the collision energyThe floor received most of the collision energy and the force of the ball on the floor is upwards. |

## What is the volume of the balloonA 2m3 balloon filled with helium at sea level climbs to 10,000 m. The temperature at sea-level is 20C, What is the volume of the balloon at 10,000 m |

## How high is the sunflower on the spacecraftA 1300 {rm N} crate slides 13 {rm m} down a ramp that makes the angle of 30^circ with the horizontal. If the crate slides at a constant speed, how much thermal energy is created. |

## Determine the change in heat of the hot waterSuppose 28.5 kg of 87.5°C water is placed in contact with 28.5 kg of 11°C water. What is the change in heat (in J) of the hot water |

## What is the period of the waveA wave has a speed of 500.0 m/s and a wavelength of 4.9 m. What is the frequency of the wave? What is the period of the wave? |

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