When do you think did the present day humans first appeared on earth?

What are the surfaces of the outer planets mostly made of

Cereal plants gain chemical potential energy as they grow. which form of energy is converted to create the chemical potential energy?

A 970 kg car starts from rest on a horizontal roadway and accelerates eastward for 5 s when it reaches a speed of 25 m/s. What is the average force exerted on the car during this time? (Hint: Find acceleration of the car, then use the equation F=ma.

Find the lengths of each of the following vectors (a) 2i + 4j + 3k (b) 5i - 2j + k (c) 2i - k (d) 5i (e) 3i - 2j - k (f) i + j + k

A light bulb produces light with frequency = 4.65 x 1014 Hz. What is the wavelength of light the bulb produces? 6.45 x 10-7 meters 1.55 x 106 meters 6.45 x 1021 meters 1.395 x 1023 meters

To change gross income, someone would need to? save more per month. reduce deductions. earn more money. increase withholdings.

An elevator (mass 4150 kg) is to be designed so that the maximum acceleration is 0.0800g. what is the maximum force the motor should exert on the supporting cable?

Car batteries are often rated in ampere-hours. Does this information designate the amount of (a) current, (b) power, (c) energy, (d) charge, or (e) potential the battery can supply?

If an airplane flies at 364 km/h, how long will it take to get from New York to Washington DC (288 km) ? (If needed, round to the nearest thousandths and answer with unit 'h' for hours.)

If a bar magnet is broken into two pieces, each of the resulting pieces