st pic is the problem 2nd pic is the solution question to answer: why was cos80 disregarded? can you explain the encircled part of the solution ( i was confused and need to understand how it happened)

Q: A wire with mass 50.0 g is stretched so that its ends are tied down at points 90.0 cm apart. The…

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Q: What condition is necessary for a real image in a concave mirror? A.) Object outside the focus B.)…

A: Given information :- Here it is given that the image is real formed by a concave mirror and for this…

Q: An 8.5-kg block is pushed along a horizontal rough surface by a 40-N force inclined at 20° with the…

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Q: The BMR for a man is following the equation = ((10 x weight (kg) + 6.25 x height (cm)- 5 x age…

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Q: Compute the minimum distance that a truck slides on a horizontal asphalt road if it is traveling at…

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Q: Part C After the switch has been closed a long time, it is opened again. Just after it is opened,…

A: Current through the L-R circuit is given by the expression i =VR2(1-e-RtL)After a long time, t =∞i…

Q: An astronaut has left the International Space Station to test a new space scooter. Her partner…

A: A) initial velocity (u) = 15 ms , towards right final velocity (v) = 5 ms , towards right

Q: FIND IMPULSE VALUE Force=12.1 N Time=2.3 s

A: Giveb that F=12.1N And time duration of action, t = 2.3s Then according to the formula of impulse…

Q: 1 gal = - * 10^6 10^4 10^3 10^2 Gravity method: Physical property d Suitable for Density contrast -…

A: 1 gal = 10^2 Option d is correct. Gravity method: physical property density contrast, suitable for…

Q: How do electromagnetic waves differ from sound waves?

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Q: Calculate the efficiency of a heat engine which takes in 7 million Joules of energy into the hot…

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Q: Question 22 A steel rod having a length of 150 m and a cross sectional area of 300mm^2 is suspended…

A: Given: The length of the rod is 150 m. The cross-section area of the rod is 300 mm2. The tension in…

Q: An electron experiences a magnetic force of magnitude 6.95 x 10^-3 N when moving at an angle of 60…

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Q: What is needed so that we can use the AC power source in appliances that requires only low AC power?

A: Transformer is device which can be two types according to its working. If a transformer convert high…

Q: R 4R Cutout View Cross-Section View Note: Figures not drawn to scale. A nonconducting sphere of…

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Q: 6. A proton moves through a uniform magnetic field, B = 5μT at a velocity, v= 8 x 10-6m/s. Calculate…

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Q: A 0.20 kg meterstick is pivoted at the 40 cm mark. Where should a sack of onions with mass 0.50 kg…

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Q: 1. All magnetic fields originate in A. iron atoms B. permanent magnets C. magnetic domains D. moving…

A: As per our guidelines, we can answer only first 3 questions. 1. All magnetic field originate in…

Q: An 8.00-μF capacitor is fully charged by a 240-V battery, which is then disconnected. Next, the…

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Q: 10. If the dielectric used in the capacitor were a 0.010-mm-thick sheet of nylon, what would be the…

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Q: An iron ball with mass 180g is attached to a chain that is 1.2m long, suspended at an angle of 55…

A: Draw the schematic diagram of the system.

Q: What is physics

A: Physics:

Q: It takes 3.8 x 10-5 s for a pulse of radio waves from a radar to reach a plane and bounce back. How…

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Q: A wooden block of mass M, attached to a massless spring with spring constant k, rests on its…

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Q: Find the displacement Work done=250 J Force=26 N

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Q: When additional factors are taken into account, the optimal throwing angle is typically   Question…

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Q: In the figure below, Determine the resistance and current between A&B by using Delta to Star…

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Q: X: Mass of crate: 100 kg μk: 0.25 Determine the maximum compression, x. k = 2 kN/m- A 10 m MAAN 45°…

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Q: Suppose there are two wagons having different masses but same kinetic energies. Which of the…

A: Correct option is - I and III .

Q: How to find the direction of the induced field, the direction of the current, and the polarity of…

A: Electric and magnetic fields (EMFs) are invisible areas of energy, often referred to as Radiation,…

Q: mirror/ If a concave mirror/convex concave lens/convex lens has a radius of 4 cm and the height of…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: 1. Consider a beam of electrons that moves from the electron gun towards the screen of a cathode ray…

A: Given data, Potential difference (V)= 15 kV magnetic Field (B)=250 μT

Q: An electron strikes the screen of the cathode ray tube with a velocity of 10 to the 9th power cm/s.…

A: Please note : As per answering guidelines I can answer the first question only. Since, this is not a…

Q: Determine the magnitude and direction of the electric field at a point in the middle of two point…

A: Draw the schematic diagram of the system.

Q: Wave Addition & Phasors Two waves travel in the same direction. They have equal wavelength but…

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Q: Materials: 6 pcs coins Procedure: 1. Arrange the coins in a horizontal pattern. 2. Move one coin…

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Q: Find the value of impulse

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Q: Suppose you use 57 kWh (kilowatt hours) of electricity at $0.35 per kWH, 91 kWh at $0.26 per kWh,…

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Q: A 30kg of iron was put in a container with 14.33 kg water. The water is at 10°C and the iron has an…

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Q: Mass of forklift: 1,000 kg Mass of crate: 750 kg The driver is raising the crate at 2 m/s².…

A: GivenMass of forklift, M=1000 kgMass of crate, m=750 kga=2 m/s2

Q: Find the pressure Force=2.6 N Area=1 m2

A: Given data :              Force  (F) = 2.6 N              Area (A) = 1 m2

Q: A ball is thrown at a 60.0° angle above the horizontal across level ground. It is thrown from a…

A: The ball was thrown at an angle with the horizontal line. We will split the velocity into vertical…

Q: Distance=280 m Time=20 s Find speed of car

A: We need to calculate the speed of the car.

Q: Khufra works at a spring factory and he was assigned to test a certain spring, whose constant is 50…

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Q: show that the centre of a rod of mass M and Length L Llies midway between its ende, gesuming the rod…

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Q: What is the mass of a truck if it produces a force of 14,000 N while accelerating at a rate of 5…

A: Given Force truck produce F = 14000 N Acceleration  a = 5 m/s2 To find  mass of truck

Q: A 1400-kg car is brought from 25 m/s to 10 m/s over a time period of 5.0 seconds. Determine the…

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Q: A solid sphere with mass M, radius r, and moment of inertia I is released from rest at the top of a…

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Q: Given data: Force=2 N Area 0.7 mm2 Find pressure

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Q: Read the questions carefully and answer them briefly. Provide illustrations whenever possible. 1.…

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Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.