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how many atoms of magnesium are in the magnesium molecule?

A 1000 kg car is initially at rest. If the motor does 10,000J of work on the car, what is the car’s final speed? (Neglect friction, and assume that the car is on level ground.)

A 0.035 kg spherical oil droplet has charge of +1×10-7C. A uniform electric field is acting upwards as shown below. What strength of electric field is required to make the sphere float in the air without moving?

A 2 kg block is being pulled by a rope with a tension of 3N at an angle of 45° as shown. The coefficients of friction are μk=0.4 and μs=0.5. Does the block slide or not?

A 100 kg car is traveling at 20m/s over the top of a circular hill as shown below. The radius of the circle is 200 m. What force does the ground exert on the car at the top of the hill? After reaching the top of the hill, the car descends a vertical dista...

A 2 kg block with initial velocity +2m/s collides with a stationary 6 kg block with initial velocity 0m/s on a frictionless surface. After the collision, the 2 kg block is moving at –1 m/s and the 6kg block is moving to the right at +1 m/s. Show that the...

It is a dark clear night. The air temperature is 15◦ C. A body is discovered at midnight. Its temperature is 23◦ C. One hour later, the body has cooled to 20◦ C. Use Newton’s law of cooling to determine the time of death.

A person is running from a cliff into a pond. The cliff has a height of 10.0m above the water but it is not strictly vertical, it slopes down to the pond at an angle of 40 degrees with respect to the vertical. What is the minimum speed the person needs to...

You're driving on the freeway going 90km per hour and it starts to rain. The raindrops make an angle of 40 degrees with the vertical when viewed through the driver's side window. What is the speed of the raindrops measured by someone at rest relative to t...