Why is most space exploration accomplished with spacecraft that do not have astronauts on board

En un juego de béisbol, un lanzador logra lanzar una pelota a 160 kilómetros por hora. Si la pelota choca con el bate, la energia cinética podría causar que el bate se rompa.

If a magnetic force in a motor is not strong enough to move, then the current applied to the motor could be increased in order to increase the magnetic force of the motor.

The law of reflection states that if the angle of incidence is 81 degrees, the angle of reflection is ___ degrees.

1. Car A has a mass of 8,000 Kg and is traveling at 40 miles per hour. Car B has a mass of 10,000 Kg and is traveling at 40 miles per hour. Which car has more kinetic energy?

A raindrop has a mass of 5.4 * 10-7 kg and is falling near the surface of the earth. Calculate the magnitude of the gravitational force exerted (a) on the raindrop by the earth and (b) on the earth by the raindrop.

Which of these is the best reason for proper nutrition? A. To ensure that you will be skinny B. To protect yourself against certain diseases C. To improve your intelligence D. To ensure that you will get good grades

And object has a mass of 15g it has a volume of 7.5ml. find the density of the object.

I need this answered quickly. is the branch of science for naming and classifying organisms based on their natural relationships? A-physics B-taxonomy C-genetics D-biology

For a fixed amount of gas, if the absolute temperature of the gas is doubled, what happens to the pressure of the gas?

A 500-kilogram sports car accelerates uni- formly from rest, reaching a speed of 30 me- ters per second in 6 seconds. What distance has the car traveled during the 6 seconds?