Why do scientists need to use radar to study venus surface

The texture of obsidian is best described as glassy. Why does obsidian contain few or no mineral grains? by the way I put it under physics because that's what it's labeled as on my side.

A boy a having a weight of 80 lb and a girl b having a weight of 65 lb stand motionless at the ends of the toboggan, which has a weight of 20 lb.

if a wave has a period frequency of 25 hz what is the period of wave in seconds round to 3 decimal places

The turnbuckle is tightened until the tension in the cable AB equals 2.3 kN. Determine the vector expression for the tension T as a force acting on member AD. Also find the magnitude of the projection of T along the line AC.

What is the efficiency of a device that takes 400J of heat and does 120J of work while giving off 280 J of heat

The grounded conductor and the grounding conductor are one and the same conductor and perform the same function.

Summarize Newton's First Law

13. How is 0.00069 written in scientific notation? A. 69 x 10-5 B. 6.9 x 104 C. 0.69 x 10-3 D. 6.9 x 10-4

A 1300 kg sports car accelerates from rest to 95 km/h in 7.4 s. What is the average power delivered by the engine?.

Two children playing on a frictionless garden gate invent a new game called "gate". The idea is that they will get on opposite sides of the gate and each push such that the gate does not move.