How many black holes are there in the Andromeda galaxy?

From the half-life for 14c decay, 5715 yr, calculate the age of the shroud.

Ball A has mass 5.0 kg and is moving at - 3.2 m/s when it strikes stationary ball B, which has mass 3.9 kg, in a head-on collision. If the collision is completely inelastic, what is the common velocity of balls A and B?

Under which stage of sleep are people least responsive to outside stimulation

You are standing on a train station platform as a train goes by close to you. As the train approaches, you hear the whistle sound at a frequency of f1 = 95 Hz. As the train recedes, you hear the whistle sound at a frequency of f2 = 78 Hz.

A 2-kW resistance heater in a water heater runs for 3 hours to raise the water temperature to the desired level. Determine the amount of electric energy used in both kWh and kJ.

What is a scientific theory? A law that is always true a hypothesis about nature and educated guess based on observations an explanation on how the natural world works?

How does weathering affect statues?

What is the distance between ground to the lowest clouds?

Which of these is a risk of speeding A. Longer braking distance B. Greater likelihood of being distracted C. Tire damage D. Mechanical failure

Q 1: Calculate the pressure. Linda is pulling her sled carrying a present with a force of 900 N acting towards the ground. The sled has a total area of 3 cm2. Find the pressure under the sled by applying the formula.