Aposition-time graph is shown below:

a position versus time graph is shown with y-axis labeled position in centimeters up to 15 and x-axis labeled time in seconds up to 10. a straight line connects the points 0, 0 and 3, 3. a horizontal line connects points 3, 3 and 6, 3. a straight line connects 6, 3 and 10, 11.

which statement accurately describes the speed of the object in the graph above over the 10 seconds?

speed is decreasing.
speed is constant.
speed is not constant.
object is at rest.

The position of a dragonfly that is flying parallel to the ground is given as a function of time by r⃗ =[2.90m+(0.0900m/s2)t2]i^− (0.0150m/s3)t3j^. a: at what value of t does the velocity vector of the insect make an angle of 34.0 degree clockwise from the x-axis? b: at the time calculated in part (a), what is the magnitude of the acceleration vector of the insect? c : at the time calculated in part (a), what is the direction of the acceleration vector of the insect?

Which of the following is the best name for mgcl2

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)