What is the magnitude of the force of gravity acting on a box that has a mass of 100 kilograms and is at sea level? a. 10.20 newtons b. 98 newtons c. 1,020 newtons d. 980 newtons

Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?