Radio telescopes can sometimes detect stars which are behind dust clouds.

a. True

b. False

A rocket passing the earth with high speed will look shorter for the stationary observer measuring the size on earth than traveler in rocket. O True O False

A baseball exerts a average of 600 newtonss east on a ball imparting an impulse of 3.6 newton seconds east to the ball caculafe the amount of time the baseball bat is in contact with the ball

Hy would you expect sodium (Na) to react strongly with chlorine (Cl) ?

A new grill has a mass of 30.0 kg. You put 3.0 kg of charcoal in the grill. You burn all the charcoal and the grill has a mass of 30.0 kg.

5 factors that drive population growth?

Compare the friction force on the cart when it is rolling along the blacktop parking lot to the friction force on the cart when it is inside the grocery store (assume the flooring is smooth vinyl tile).

Which of the following objects has the most kinetic energy? a car going 60 miles per hour a spring that is compressed a rock sitting on the edge of a cliff a bicycle going 10 miles per hour

Which type of environment results from an equal amount of solute and solvent in and out of the cell? A. hypertonic environment B. isotonic environment C. hypotonic environment D.

If a 75 W lightbulb operates at a voltage of 120 V, what is the current in the bulb?* A. 1.6A B. 9000 A C. 195 A D. 0.63 A

A resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. Long after contact is made with the battery (a) the voltage across the capacitor is A) equal to the battery's terminal voltage.