Suppose you pour hot coffee for your guests, and one of them wants to drink it with cream, several minutes later, and then as warm as possible. In order to have the warmest coffee, should the person add the cream just after the coffee is poured or just before drinking? Explain.

Q: 15-109. The elastic cord has an unstretched length lo = 1.5 ft and a stiffness k= 12 lb/ft. It is at...

A: From the figure, conservation of total energy TB+VB=TC+VC12mvA2+12ks12=12mvC2+12ks22   Substitute, 0...

Q: Three identical cars are being unloaded from an automobile carrier. Cars B and C have just been unlo...

A: Given quantities: Velocity of car A (vA) = 5.76 ft/s Velocity of car B after first collision (vB1) =...

Q: The separation distance between the two plates of a parallel plate capacitor is 2.23 cm. An electron...

A:

Q: Help please

A:

Q: The temperature of the water vapor (H2O) inside a pressure cooker increased from 295 K to 395 K. Ast...

A: The initial temperature of the water vapor, Ti=295 K   The final temperature of the water vapor, Tf=...

Q: An ideal projectile is launched at a 37.3-degree angle from the horizontal with an initial speed of ...

A: At the maximum height of an ideal projectile, the velocity along the vertical direction is zero. The...

Q: A sealed can of your favorite soda has a carbon dioxide gas (CO2) volume of 0.05 L. When it isrefrig...

A: According to Boyle's law, at constant temperature, the product of pressure and volume of the gas rem...

Q: A park ranger driving on a back country road suddenly sees a deer "frozen" in the headlights 22.98 m...

A: The equation will be used is given below: v2-u2=2aS Here v is the final velocity ,u is the initial v...

Q: State the relation between torque and angular momentum in rotational motion. A 1.8-kg particle moves...

A:

Q: A shooting star is a meteoroid that burns up when it reaches Earth's atmosphere. Many of these meteo...

A: Given data The mass of the meteoroid is mm = 5.64 g. The velocity of the meteoroid is vm = 48.1 km/s...

Q: What is the lux level on a surface at 1m for a 1600 lumen light bulb?

A: The lux level is given by, E=LA Here, L is the light output and A is the area.

Q: A jet fighter flying at 300 m/s (just below the speed of sound) makes a turn of radius 2.20 km. The ...

A:

Q: A = 2 X 1025, B = 4.5 X 10-10, C = 3 X 10-6.     (1) AB/C = ?     (2) ACB = ?

A: A=2×1025 B=4.5×10-10C=3×10-6 ABC=2×10254.5×10-103×10-6ABC=2×4.53×1025×10-1010-6ABC=3×1025×10-10×106A...

Q: How many mol of lithium are there in 1.204 x 1024 lithium atoms?

A:

Q: A rocket is fired from rest at x = 0 and travels along a parabolic trajectory described by y2 = [120...

A: AIM: To determine the magnitude of acceleration (a) and velocity (v) at a time (t) GIVEN: The trajec...

Q: Imagine that you fill a balloon at sea level (1.0 atm) with 18 L of air. You are taking the balloon ...

A: Assume that the temperature remains constant. According to Boyle's law, at constant temperature, the...

Q: A block of mass 5 kg is sitting on a frictionless surface. The block is initially at rest. A force o...

A: Initial momentum  pi=mivi=5 kg0=0

Q: A daredevil on a motorcycle leaves the end of a ramp with a speed of 30.5 m/s as in the figure below...

A: Given, Initial velocity is 30.5 m/s velocity at maximum heigh is 28.8 m/s

Q: Two vectors have the following magnitude, A = 9.7 m and B = 14.6 m. Their vector product is: AXB = -...

A:

Q: When a wave hits a material interface, it can be absorbed, reflected or transmitted by the second ma...

A: Absorption: We know that the materials are made up of atoms that are bonded together. These atoms vi...

Q: A 1500 kg car travels at 30 m/s and then quickly stops in 4.2 s to avoid an obstacle. What is the In...

A: The initial momentum of the car is given by, pi=mvi Here, m is the mass of the car and vi is the ini...

Q: A 200-N child is in a swing that is attached to ropes 2.00 m long. Find the gravitational potential ...

A: Given: Weight of the child = 200 N Length of the rope = 2 m  

Q: A car with mass of 1138 kg accelerates from 0 m/s to 40.0 m/s in 10.0 s. Ingnore air resistance. The...

A: Solution:   Given Values, Mass (m)=1138 Kginitial velocity(u)=0 m/sfinal velocity(v)=40 m/stime(t)=1...

Q: Which list contains only transverse waves

A: There are two categories of wave: Longitudinal wave Transverse wave Longitudinal wave are those th...

Q: Use the similarity between Coulomb's Law and the Law of Universal Gravitation to calculate the dista...

A: Solution: Given That Q1 = 8.55x10-6 C  Q2 = 5.3x10-6 C  U = 5.45 J Using the coulombs Law U = keq1q2...

Q: A firefighter slides down a pole in a fire station with an acceleration of 5.29 m/s^2. If the firefi...

A: the initial speed of the fire fighter is zero.

Q: The resistance of an electric heater is 55 Ω when connected to 120 V.  How much energy does it use d...

A: Given, Resistance R = 55 ohm Voltage V = 120 V Time t = 35 minute

Q: An average factory has a sound intensity level of 80 dB, and a rock band has a sound intensity level...

A: 80=10logII0         ...... (I)110=10logI'I0           ......(II)(II)=(I)30=10logI'I03010=logI'I03=lo...

Q: see photo :)

A: Given:     mass, m = 2.5 kg     time, t = 3.9 s     initial velocity, u = 0 m/s    two forces acting...

Q: cart initially moving at 20 m/s slows down at a steady rate of 4 m/s2 for 4 s. It next maintains the...

A: Given: The initial speed of the car is 20 m/s. The deceleration of the car is 4 m/s2. The time durat...

Q: When the angle between the string and the stem decreases, the tension in the string increases. What ...

A:

Q: A wire of length L has resistance R. If the wire is now cut into three equal length pieces length pi...

A: Assume a wire if length L and resistance R. Since the resistance is directly proportional to the len...

Q: What would be the period of revolution of a hypothetical planet whose circular orbit around the sun ...

A:

Q: As the distance from the pivot point to the chord decreases, the tension in the chord increases. Wha...

A: Given, Tension in chord increase when distance from the pivot point decreases

Q: A mass of 2.1 kg oscillate on a horizontal spring with a spring constant of 120 N/m. When the mass p...

A: Given Data: The mass of an object is, m=2.1 kg The spring constant is, k=120 N/m The speed is, v=3.4...

Q: under what conditions the tension in the string pulling horizontally on the cart equal in magnitude ...

A: Introduction: The friction is a resistance that opposes the motion of the body in a direction opposi...

Q: A car initially traveling eastward turns north by traveling in a circular path at uniform speed as i...

A:

Q: Simulate projectile motion with air resistance in PhysLab. A shuttlecock is launched from the ground...

A: Given:       Initial velocity, u = 34.6041 m/s       Angle made wrt the horizontal, θ = 5.1609o     ...

Q: A copper wire has a resistance of 0.400 Ω at 20.0°C, and an iron wire has a resistance of 0.426 Ω at...

A: To determine: The temperature at which the resistance of the copper and iron will be equal   Given: ...

Q: At what point in the motion of a simple pendulum is the string tension greatest? Least? In each case...

A: The motion of the pendulum is a simple harmonic motion in which the tension in the string and gravit...

Q: A solid uniform ball with mass m and diameter d is supported against a vertical frictionless wall by...

A: Given that, The mass of the ball is m The radius of the ball is r=d/2 Length of the wire is L

Q: A hawk flies in a horizontal arc of radius 13.3 m at a constant speed 3.20 m/s. (a) Find its centrip...

A: Radius of the horizontal arc, r = 13.3 m Speed, v = 3.20 m/s Centripetal acceleration is given by- a...

Q: physics

A: The two places where the block’s speed can be determined are the starting point (spring block system...

Q: Select all of the following descriptions that match what happens when a ferromagnetic material is pl...

A: A ferromagnetic material when placed in a magnetic field, its domains gets aligned in the direction ...

Q: Physics Question

A: The schematic diagram is as shown:

Q: Question in attachment below

A: The charge stored in the capacitor is, C=QVQ=CV=65.3 μF10-6 F1 μF13.4 V=0.875×10-3 C The current flo...

Q: 2. Molly speeds along a straight road at a constant speed of 15.0 m/s. Just as she passes a parked m...

A:

First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.