Mechanics | Relativity Answers

An elevator is moving upward at 1.20 m/s when it experiences an acceleration 0.33 m/s2 downward, over a distance of 0.69 m. What will its final velocity be?

A car traveling in a straight line has a velocity of +2.3 m/s. After an acceleration of 0.74 m/s2, the car's velocity is +8.4 m/s. In what time interval did the acceleration occur?

Sally travels by car from one city to another. She drives for 29.0 min at 63.0 km/h, 37.0 min at 40.0 km/h, and 45.0 min at 74.0 km/h, and she spends 14.0 min eating lunch and buying gas.
(a) Determine the average speed for the trip.
km/h
(b) Determine the total distance traveled.
km

Find the magnitude of the gravitational force
a 68.1 kg person would experience while
standing on the surface of Earth with a
mass of 5.98 × 1024 kg and a radius of
6.37 × 106 m. The universal gravitational
constant is 6.673 × 10−11 N · m2/kg2.
Answer in units of N

A caterpillar tries to climb straight up a wall two meters high, but for every 2 cm up it climbs, it slides down 1 cm. Eventually, it reaches the top. When it reaches the top, it does not pull itself over so it will slide down 1 cm.

What is the total distance traveled?

a ship leaves port at 1 pm traveling north at the speed of 30 miles per hour. At 3 pm the ship adjust its course 20 degrees eastward, how far was the ship from the port at 4pm.

Suppose you have a rectangular wooden block with dimensions 8.0 cm x 8.0 cm x 9.0 cm that has a density of 0.85 x 10^3 kg/m^3. The block has a cylindrical hole inside it so that a lead cylinder 5.0 cm in diameter and 7.5 cm high can be fitted completely inside. What is the volume of the lead cylinder that fits inside (in m^3)? What is the mass of the lead cylinder if the density of lead is 1.13 x 10^4? (Density kg/m^3)? What is the volume of the wood in the wooden block (excluding the volume of the cylindrical hole)?

A woodworker has made four small toy airplanes and one large toy airplane and wants to paint them. All airplanes are exactly the same shape, and all are made of the same wood. The larger plane is twice as large in every dimension as one of the smaller planes.

i. The amount of paint required to paint the planes is directly proportional to the surface area. Will the amount of paint required for the single plane in case A be greater than, less than, or equal to the
amount of paint required for all four planes in case B?

ii. Will the weight of the single large plane be greater than, less than, or the same as the weight of the four small planes combined?

Your pancake recipe calls for 1.5 cups of flour to make 20 four-inch pancakes. But you want to make
twelve eight-inch pancakes. How much flour should you use?

A 1100kg Car Accelerates From Rest To 60.0 Km/h Over A Distance Of 45 M. find the net force acting on the car.