2. A 4.5 kg model rocket is launched, expelling 152 grams of burned fuel from its exhaust at a speed of

786 m/s. What is the speed of the rocket after the fuel has burned? Ignore the forces of gravity and air

resistance.

Gravity holds planets in orbit because planets are attracted to each other's gravitational force true or false

A 3.0-kg object moves to the right at 4.0 m/s. It collides head-on with a 6.0-kg object moving to the left at 2.0 m/s. Which statement is correct? A) The total momentum both before and after the collision is zero.

A 58.5 kg sprinter starts a race with an acceleration of 4.40 m/s2. What is the net external force on him? Give the equation used to find the net force on an object in terms of its mass (m) and its acceleration (a).

Which factors affect absorption and reflection of thermal energy? Check all that apply. color of the material mass of the material texture of the material volume of the material weight of the material

A 455 n gymnast jumps upward a distance of 2.50 meters to reach the uneven parralel bars. How much work did she do before she even began her routine

The metric unit of force is the Newton (N), which is kg∙m/s^2. Convert 10 mg∙cm/s^2 to Newtons. Be careful when working with units. A. 1 x 10^-2 N B. 1 x 10^-5 N C. 1 x 10^-6 N D. 1 x 10^-7 N

Which of the following aspects of the environmental movement addresses the public's right to intervene in environmentally damaging activities on private land?

A mine elevator is supported by a single steel cable 0.0125 m in diameter. The total mass of the elevator cage and occupants is 6450 kg. By how much does the cable stretch when the elevator hangs by 362 m of cable? (Neglect the mass of the cable.

What scientific practice is this? 1) collecting data 2) asking a question 3) providing explanations 4) communicating results

The kinetic energy of an object depends on both the objects mass and velocity. a. True b. False