opp

This page lists questions and answers that were posted by visitors named opp.

Questions

The following questions were asked by visitors named opp.

Grace is playing with her dolls and decides to give them a ride on a merry-go-round. She places one of them on an old record player turntable and sets the angular speed at 45.0 rpm. (a) What is their angular speed in rad/s? 1 Correct: Your answer is corre...

A hang glider moving at speed 9.0 m/s dives to an altitude 4.2 m lower. Ignoring drag, how fast is it then moving?

A uranium nucleus (mass 238 u), initially at rest, undergoes radioactive decay. After an alpha particle (mass 4.0 u) is emitted, the remaining nucleus is thorium (mass 234 u). If the alpha particle is moving at 0.052 the speed of light, what is the recoil...

A 0.01-kg baseball traveling in a horizontal direction with a speed of 11 m/s hits a bat and is popped straight up with a speed of 15 m/s. (a) What is the change in momentum (magnitude and direction) of the baseball?

An experimental flywheel, used to store energy and replace an automobile engine, is a solid disk of mass 202.0 kg and radius 0.35 m. (a) What is its rotational inertia? (b) When driving at 22.4 m/s (50 mph), the fully energized flywheel is rotating at an...

A sound wave with intensity 37 mW/m2 interferes constructively with a sound wave that has an intensity of 18 mW/m2. What is the intensity of the superposition of the two?

Calculate the number of H2O molecules in a human body of mass 66.5 kg. Assume that, on average, water makes up 62% of the mass of a human body. (Use 1.0 u for the atomic mass of hydrogen, and 16.0 u for the atomic mass of oxygen.) 1

A cylinder in a car engine takes Vi = 4.50 10-2 m3 of air into the chamber at 30° C and at atmospheric pressure. The piston then compresses the air to 0.112 times of the original volume (0.112 Vi) and to 24.0 times the original pressure (24.0 Pi). What is...

What is the total translational kinetic energy of the gas molecules of 0.470 mol of air at atmospheric pressure that occupies a volume of 1.00 L (0.00100 m3)?

A 0.600-kg aluminum teakettle contains 4.00 kg of water at 26.0° C. How much heat is required to raise the temperature of the water (and kettle) to 100.0° C?

A 30.0-g lead bullet leaves a rifle at a temperature of 89.0° C and hits a steel plate. If the bullet melts, what is the minimum speed it must have?

A 10.9-g iron bullet with a speed of 4.00 102 m/s and a temperature of 20.0° C is stopped in a 0.400-kg block of wood, also at 20.0° C. (a) At first all of the bullet's kinetic energy goes into the internal energy of the bullet. Calculate the temperature...

A reversible engine with an efficiency of 32.0% has TC = 304.0 K. (a) What is TH? (b) How much heat is exhausted for every 0.138 kJ of work done?

Consider the circuit in the diagram. Let R1 = 51.0 Ω, R2 = 38.0 Ω, R3 = 74.0 Ω, R4 = 16.0 Ω, and V = 84 V. (b) What current flows from the battery? (c) What is the potential difference between points A and B? (d) What current flows through each branch bet...

Two concentric circular wire loops in the same plane each carry a current. The larger loop has a current of 8.62 A circulating clockwise and has a radius of 6.09 cm. The smaller loop has a radius of 4.42 cm. What is the current in the smaller loop if the...

Unpolarized light is incident on four polarizing sheets with their transmission axes oriented as shown in the figure, in which θ1 = 27.0° and θ2 = 50.0°. What percentage of the initial light intensity is transmitted through this set of polarizers?

why do you find the same wavelengths and colors on each side of the central maxima?

how do you do-11(--5x =16 =616

Answers

The following answers were posted by visitors named opp.

thank you...what I originally did was use the wrong specific heat for iron.

Two turtles are competing in a race. Turtle A reaches the finish line in 137 hours. Turtle B finished in 125 hours. Which turtle had the faster time?

Between low tide and high tide, the width of a beach changes by −17 feet per hour. Write and evaluate an expression to show how much the width of the beach changes in 3 hours. I need help?