a second astronaut did another experiment in space. she attached a small rocket to the same ball to continuously push the ball the entire distance. it also traveled 50meters from the space station (point a) to the space ship (point d), in space. astronaut 1 measured the speed at point b to be 0.25 m/s. astronaut 2 measured the speed at point c to be 0.75 m/s. the total amount of time required for the ball to travel the 50 meters from the space station to the space ship was 1 minute 22 seconds. what was the acceleration? (hint: convert the time to seconds! )

The pressure proportional to the area a- inversely b- directly c- increase d-decrease

Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?