A 4.0 cm tall candle flame is 2.0 m from a wall.

) A 4.0 cm tall candle flame is 2.0 m from a wall. You happen to have a lens with a focal length of 32 cm. How many places can you put the lens to form a well-focused image of... Read more

The Eiffel Tower in Paris is 984 ft tall and is made mostly of steel.

Problem 14.07 The Eiffel Tower in Paris is 984 ft tall and is made mostly of steel. Part A If this is its height in winter when its temperature is -8.00 ∘C, how much additional vertical distance must you cover... Read more

A person bending forward to lift a load “with his back” rather than “with his knees”

A person bending forward to lift a load "with his back" rather than "with his knees" can be injured by large forces exerted on the muscles and vertebrae. The spine pivots mainly at the fifth lumbar vertebra, with the principal... Read more

Solve numerically for the magnitude of the force Fm in Newtons.

A box with mass m = 2.5 kg rests on the top of a table. The coefficient of static friction between the box and the table is μs = 0.61 and the coefficient of kinetic friction is μk = 0.32.... Read more

What is the magnitude of the electric field at the dot in the figure?

A. What is the magnitude of the electric field at the dot in the figure? B. What is the direction of the electric field at the dot in the figure? Choose best answer. (a) the negative x-axis. (b) the positive... Read more

What is the angular velocity of the wheel at 5 s?

(Figure 1) shows the angular position of a potter’s wheel. What is the angular displacement of the wheel between t = 5 s and t = 15 s? What is the angular velocity of the wheel at 5 s? 1... Read more

The figure (Figure 1) shows voltage and current graphs for a resistor.

The figure (Figure 1) shows voltage and current graphs for a resistor. I found part A , emf frequency = 25 Hz Part B What is the value of the resistance R? Part C Draw the resistor’s voltage and current... Read more

What will be the maximum electric field in this filament?

A cylindrical tungsten filament 14.0 cm long with a diameter of 1.30 mm is to be used in a machine for which the temperature will range from room temperature (20 ∘C) up to 120 ∘C. It will carry a current... Read more

The figure shows a light ray incident on a polished metal cylinder

The figure shows a light ray incident on a polished metal cylinder where h = R/6. At what angle θ will the ray be reflected? 1 Answer This is as much about geometry as physics. Draw a construction line from... Read more

In a hydroelectric dam, water falls 33.0m and then spins a turbine to generate electricity.

In a hydroelectric dam, water falls 33.0m and then spins a turbine to generate electricity. A. What is delta U of 1.0 kg of water? B. Suppose the dam is 80% efficient at converting the water’s potential energy to electrical... Read more

What is the free-fall acceleration on planet 2?

The free-fall acceleration at the surface of planet 1 is 22 m/s2. The radius and the mass of planet 2 are twice those of planet 1. What is the free-fall acceleration on planet 2? 1 Answer g1 = G M1/R1^2... Read more

What was the initial speed of the arrow?

An archer shoots an arrow horizontally at a target 15 m away. The arrow is aimed directly at the center of the target, but it hits 48 cm lower. What was the initial speed of the arrow? (Neglect air resistance.)... Read more

Assume that E = 46.5 V. The battery has negligible internal resistance.

Assume that E = 46.5 V . The battery has negligible internal resistance. 1. Compute the equivalent resistance of the network 2. Find the current in the 1.00 Ω resistor. 3. Find the current in the 3.00 Ω resistor. 4.... Read more

How long will you have to push for the puck to reach the same speed v?

Suppose you push a hockey puck of mass m across frictionless ice for a time, change of t, starting from rest, giving the puck speed v after traveling distance . If you repeat the experiment with a puck of mass... Read more

What is the net torque on the pulley about the axle?

https://session.masteringphysics.com/problemAsset/… What is the net torque on the pulley about the axle? (Figure 1 above) PLEASE EXPLAIN ALL PARTS OF EQUATION AND WHAT THEY MEAN FOR BEST ANSWER.(please don’t just put pi rad MR etc explain what it is) 1... Read more

What is the acceleration of the baseball?

16. A batter strikes a baseball of mass 0.15 kg with a force of 18 kN. What is the acceleration of the baseball? (Points : 3) 9.8 m/s2 120,000 m/s2 2,700 m/s2 8.3 m/s2 17. A block of metal weighs... Read more

How long will it take a rock dropped from

The radius of Mars is 3.37×106m, and it’s mass is 6.42×1023kg. How long will it take a rock dropped from 2.0m above the surface of Mars to reach the ground? I don’t even know where to begin with this question…everything... Read more

As the balls reach their maximum displacement, their kinetic energy reaches __________.

Four balls, each of mass m, are connected by four identical relaxed springs with spring constant k. The balls are simultaneously given equal initial speeds v directed away from the center of symmetry of the system as shown in (Figure... Read more

What subscripts are needed to complete the formula unit Li_N_?

Please help me, I don’t understand, thanks in advance. Question 1 (Multiple Choice Worth 2 points) Which of the following is a possible formula unit? Li3B ClO2 LiCl PbN ——————————————————————————– Question 2 (Essay Worth 3 points) What is the formula... Read more

Which of the following have a standard enthalpy of formation (ΔHf°) equal to zero?

Which of the following have a standard enthalpy of formation (ΔHf°) equal to zero? 1) F2(g) 2) Hg(l) 3) NH3(g) 4)C(diamond) 2 Answers F2(g) and Hg(l) have a standard enthalpy of formation (ΔHf°) equal to zero. They are elemental and... Read more

A light plane must reach a speed of 33 m/s for takeoff.

A light plane must reach a speed of 33 m/s for takeoff. How long a runway is needed if the (constant) acceleration is 3.0 m/s(squared)? I don’t know what i’m doing!! 3 Answers Your working formula is Vf^2 – Vo^2... Read more

What is the work done by tension before the block goes up the incline?

A mass m = 16 kg is pulled along a horizontal floor with NO friction for a distance d =7.7 m. Then the mass is pulled up an incline that makes an angle θ = 34° with the horizontal and... Read more

Suppose a child drives a bumper car head on into the side rail, which exerts a force of 2400 N

Suppose a child drives a bumper car head on into the side rail, which exerts a force of 2400 N on the car for 0.500 s. (Assume the initial velocity is in the positive direction.) (a) What impulse (in kg... Read more

What is the change in the internal energy of the rocks?

In outer space a rock with mass 4 kg, and velocity < 3300, -3200, 3000 > m/s, struck a rock with mass 12 kg and velocity < 270, -270, 200 > m/s. After the collision, the 4 kg rock’s velocity... Read more

A bicycle wheel has an initial angular velocity of 1.50 rad/s.

A bicycle wheel has an initial angular velocity of 1.50 rad/s. a) If its angular acceleration is constant and equal to 0.300 rad/s2 , what is its angular velocity at t=2.50s? b) Through what angle has the wheel turned between... Read more