The half-life of a radioactive isotope is 140 d. How many days would it take for the decay rate of a sample of this isotope to fall to one-fourth of its initial value?

Q: A car starts from rest and reaches a velocity of 40 m/s in 10 s, what will its velocity be 5 s…

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Q: An object of mass 200 g moving at a constant speed of 2 m/s has a net force closest to

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Q: 14 A 4.0 x 10-watt motor applies an 8.0 x 10- newton force to move a boat at constant speed. How far…

A: To solve this question we have to knowledge about some basic formula that is given below  Power =…

Q: An airplane travels 40 miles in 10 minutes, then travels 20 miles in 80 minutes. Is the pilot…

A: Given data :- distance d1 = 40 miles time t1 = 10 minutes distance d2 = 20 miles time t2 = 80…

Q: 1. You are running from a gang of shady looking characters. You run across a draw bridge to elude…

A: Let at an angle θ start sliding  Now, by fbd   Normal reaction (N) = mgCosθ  So, limiting friction…

Q: A 9900 N small car is moved by a 650 N force. If the car starts from the rest, then how fast is it…

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Q: A measure of how fast your speed is changing is a measure of force acceleration velocity average…

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Q: A rock is thrown downward from a top of a building with an initial speed of 20 m/s. It strikes the…

A: The problem involves the kinematics of a falling object due to gravity, which can be described by…

Q: An unfortunate astronaut loses his grip during a spacewalk and finds himself floating away from the…

A: Using conservation of momentum ma+mbvi=mavaf+mbvbfvbf=ma+mbvi-mavafmb

Q: birdman is flying 15 m/s

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Q: You push a 12 kg block with a force of 32 N for a distance of 4.1 m. If it started from rest, how…

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Q: A point-charge qa = -5.00×10-C is held fixed at xA = -0.400 m. How much work needs to be done by a…

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Q: Bike starts with initial velocity of 10 m/s with acceleration of 1 m/s, how much will be its…

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Q: A car begins from rest and reaches a speed of 20 m/s in 5 seconds. The acceleration of the car is…

A: Given data:  Initial velocity (u) = 0 m/s Final velocity (v) = 20 m/s Time (t) = 5 s Required:…

Q: what is the max and min speed?

A: Solution: Hmax = h + 2σ Hmax = 57.6 + (2 x 3.746) Hmax = 65.092  Vmax = √(2 x 9.8 x 65.092) Vmax =…

Q: It has been found that a 1500 kg car can stop in 32 m from a speed of 20 m/s. How much force do the…

A: The car's motion is, m=1500 kg The initial speed of the car is, u=20 m/s The distance traveled by…

Q: 1. Can we have a case in which there is no force acting on an object and yet the object is traveling…

A: Answer:-   No Can we have a case in which there is no force acting on an object and yet the object…

Q: An airplane reaches a velocity of 80 m/s when it takes off. If the runway is 1 km in length, what…

A: Acceleration can be found by using equation of motion .

Q: A small airplane has an airspeed (speed with respect to air) of 200 km/h. a) Find the time for the…

A: Given Data:- Airspeed of the airplane is vp=200 km/h Concept:- From the relationship of time, speed…

Q: An east bound plane leave Houston for Miami with 30mph tailwind at its back and arrives in 4 hours.…

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Q: You are driving a car down a straight highway when you come upon a sudden accident. You slam on your…

A: While you slam in your brakes, the velocity of your car decreases. this is due to the fact the brake…

Q: Starting at 10am, you bicycle at an average speed of 15 mph until noon when you enter the mountains.…

A: For the first part,The bicycle travelling from 10 am to noon(12 pm) at a speed of 15…

Q: you slam on your automobile brakes, sliding 40 feet with locked brakes. how much further would slide…

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