2022-03-30

You can still ask an expert for help

asked 2021-02-06

Starting with an initial speed of 5.00 m/s at a height of 0.300 m, a 1.50 kg ball swings downward and strikes a 4.60kg ballthat is at rest, as the drawing shows. a. using the principle of conservation of mechanicalenergy,find the speed of the 1.50 kg ball just before impact b. assuming that the collision is elastic, find the velocities( magnitude and direction ) of both balls just after thecollision c. how high does each abll swing after the collision, ignoringair resistance?

asked 2021-04-25

Flux through a Cube (Eigure 1) A cube has one corner at the origin and the opposite corner at the point (L, L, L). The sides of the cube are parallel to the coordinate planes

asked 2020-10-23

A lunch tray is being held in one hand, as the drawing illustrates. The mass of the tray itself is 0.200 kg, and its center of gravity is located tits geometrical center. On the tray is a 1.00 kg plate of food and a 0.190 kg cup of coffee. Obtain the force T exerted by the thumb and the force F exerted by the four fingers. Both forces act perpendicular to the tray, which is being held parallel to the ground.

asked 2020-11-22

A 0.145 kg baseball pitched at 39.0 m/s is hit on a horizontal line drive straight back toward the pitcher at 52.0 m/s. If the contact time between bat and ball is $1.00\times {10}^{-3}$ s,calculate the average force between the bat and ball during contest.

asked 2022-04-06

What molality of a nonvolatile, nonelectrolyte solute is needed to raise the boiling point of water by ${7.10}^{\circ}C\text{}({K}_{b}={0.520}^{\circ}C/m)$ ?

asked 2022-06-06

In AoPS' (Art of Problem Solving) proof of Muirhead's inequality, how does the below equality work out?

The below equation appears to show two expressions (1 and 2), each under the symmetric sum notation, being multiplied together to produce expression 3, which is also under the symmetric sum notation...

but normally,$[{A}_{1}+{A}_{2}(\dots )+{A}_{n}]\cdot [{B}_{1}+{B}_{2}+(\dots )+{B}_{n}]$ is not $[{A}_{1}{B}_{1}+{A}_{2}{B}_{2}+(\dots )+{A}_{n}\cdot {B}_{n}]$ ,

that is, when we multiply the sum of ${A}_{i}(i=[1,\text{}n])$ and ${B}_{i}(i=[1,\text{}n])$, the result is not the sum of ${A}_{i}\cdot {B}_{i}(i=[1,\text{}n])$

The below equation appears to show two expressions (1 and 2), each under the symmetric sum notation, being multiplied together to produce expression 3, which is also under the symmetric sum notation...

but normally,$[{A}_{1}+{A}_{2}(\dots )+{A}_{n}]\cdot [{B}_{1}+{B}_{2}+(\dots )+{B}_{n}]$ is not $[{A}_{1}{B}_{1}+{A}_{2}{B}_{2}+(\dots )+{A}_{n}\cdot {B}_{n}]$ ,

that is, when we multiply the sum of ${A}_{i}(i=[1,\text{}n])$ and ${B}_{i}(i=[1,\text{}n])$, the result is not the sum of ${A}_{i}\cdot {B}_{i}(i=[1,\text{}n])$

asked 2021-09-04

The probability that a student owns a car on a college campus is 65% the probability that a student owns a computer is 82% and the probability that a student owns both is 55%.

What is the probability that a student randomly selected owns a car or computer?

What is the probability that a randomly selected student does not own a car or computer?

What is the probability that a student randomly selected owns a car or computer?

What is the probability that a randomly selected student does not own a car or computer?