A speedboat starts from rest and accelerates at +2.15m/s^{2 }for 8.35 s. At the end of this time, the boatcontinues for an additional 8.62 s with an acceleration of +0.629m/s^{2}. Following this, the boat accelerates at -0.968m/s^{2} for 8.87 s. (a) What is the velocity of the boat at t = 25.84 s? (b) Find the total displacement of the boat.

Define what is the molar mass of the protein : A solution containing 27.05 mg of an unknown protein per 22.0 mL solution was found to have an osmotic pressure of 3.10 torr at 12 C. What is the molar mass of the protein |

What is the temperature of the mixture : A child complains that her 160 g of milk is too hot at 90 degree C. She then pour 80 g of cold milk at 7 degree C in it. If the specific heat of milk is 3800 J/kg.K, what is the temperature of the mixture? |

A moving particle encounters an external electric field : A moving particle encounters an external electric field that decreases its kinetic energy from 9520 eV to 7060 eV as the particle moves from position A to position B. |

A baseball is thrown horizontally from from a height : A baseball is thrown horizontally from from a height of 44.10 mabove ground with a speed of 33.5 m/s. Where is the ballafter 3.00 s have elapsed? |

Find the total displacement of the boat : A speedboat starts from rest and accelerates at +2.15m/s2 for 8.35 s. At the end of this time, the boatcontinues for an additional 8.62 s with an acceleration of +0.629m/s2. Following this, the boat accelerates at -0.968m/s2 for 8.87 s. |

What is the elctrical force acting on the alpha particle : An alpha particle (charge +2.0e) is sent at high speed toward a gold nucleus (charge +79e). What is the elctrical force acting on the alpha particle when it is 2.0e-14m from the gold nucleus? |

Does the equation of motion : Does the equation of motion V^2-U^2=2as come from the equation Vf^2=Vi^2-2gΔy ? if so where is the minus that isleft once you move Vi^2 to the right? |

The electric flux through the same rectangle : An electric field of magnitude 2210 N/C is applied along the xaxis. Calculate the electric flux through a rectangular plane 0.241m wide and 0.84 m long if the plane is parallel to the yz plane.Answer in units of N · m2/C. |

How many times as great is the intensity of the music : A certain person in a typical conversation speaks at a soundlevel of 63 dB. The music at a certain rock concert reaches a soundlevel of 110 dB. How many times as great is the intensity of the music? |

## Find the density of the cubea hollow cube with 12 cm in each side and thickness 1 cm floats half submerged in a liquid of density kg/m^3. find the density of the cube |

## With what velocity will she hit the waterJill jumps off the diving board with a velocity of 1.7 m/s at 38 degrees above horizontal. if the water surface is 2 meters below the board: with what velocity will she hit the water |

## What is change of temperature of air-amount of heat absorbedAt T = O degrees Celsius and p = 1000mb, 1g of dry air receives during an isochoric process an amount of heat. It is then observed that its pressure increases by 50mb. What is the change of temperature of the air and what is the amount of heat absorb.. |

## Find the magnitude of the acceleration of the boxesTwo boxes of masses m1 = 20.0 kg and m2=40.0 kg are connected by a rope through a pulley that has a uniform wheel of mass M=10.0 kg |

## What is the speed of the resulting ball of clayA 40.0g ball of clay traveling east at 4.50m/s collides and sticks together with a 40.0g ball of clay traveling north at 5.50m/s |

## Find the composition of this hot vaporized materialAs the fragment falls through the atmosphere, it is heated and some of the material is vaporized, find the composition of this hot vaporized material from the light it emits |

## Compute the average kinetic energy of each helium atomHelium is used to fill a balloon of diameter 31 cm at 23C and 1.5 atm. The mass of a helium atom is 4.0026 u, the conversion factor from u to kg is 1.66 × 10?27 kg/u, What is the average kinetic energy of each Helium atom |

## Determining the force of the personA 75 kg person escapes from a burning building by jumping from a window 25-m above a catching net. Assuming that air resistance exerts a 95-N force on the person all through the fall, determine out the person's velocity just before hitting the net.. |

## Find its kinetic energy at the low pointAt the low point in it swing, a pendulum bob with a mass of 0.46 kg has a velocity of 2.2 m/s. What is its kinetic energy at the low point |

## Determine the kelvin temperature of the gasA container holds 1.9 mol of gas. The total average kinetic energy of the gas molecules in the container is equal to the kinetic energy of a 7.7x10-3 kg bullet with a speed of 630 m/s |

## How much power is in the secondary circuitA (perfect) transformer has 20 V and 2 A in its primary coil, 200 turns in its primary circuit, and 20 in its second. How much power is in the secondary circuit |

## Calculate the angular displacement of the wheelA wheel is rotating about an axis that is in the z-direction. The angular velocity is w = ?6.00 rad/s at t = 0, What is the angular displacement (change in angle) of the wheel at t = 7.00s |

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