12,727 Answered Questions for the topic physics

Physics

08/26/22

a positive charge of magnitude Q1 = 0.95nC is located at the origin
a positive charge of magnitude Q1 = 0.95nC is located at the origin. A negative charge Q2 = -8.5nC is located on the positive x-axis at x=11cm from the origin. The point P is located y =17cm above... more
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Physics

08/25/22

The electrical force experienced by a -3.4μC charge at some point P has a magnitude of 19.8N and points due North.
The electrical force experienced by a -3.4μC charge at some point P has a magnitude of 19.8N and points due North. What is the ratio of the magnitude of the acceleration of an electron to that of a... more
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Physics

08/24/22

Speed and time physics
Two locomotives approach each other on parallel tracks. Each has a speed of 155 km/h with respect to the ground. If they are initially 8.5 km apart, how long will it be before they reach each other?
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Physics

08/24/22

Calculating speed and velocity
A person jogs eight complete laps around a 400-m track in a total time of 14.5 min. Calculate (a) the average speed and (b) the average velocity, in m/s.
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Physics

08/24/22

Physics 101 km/h
A bird can fly 25 km/h. How long does it take to fly 3.5 km?
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Physics

08/24/22

Velocity physics 101
You drop a rock off a bridge. When the rock has fallen 4 m, you drop a second rock. As the two rocks continue to fall, what happens to their velocities?(a) Both increase at the same rate.(b) The... more
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Physics

08/24/22

Motions and constant acceleration

Which of these motions is not at constant acceleration: a rock falling from a cliff, an elevator moving from the second floor to the fifth floor making stops along the way, a dish resting on a... more
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Physics

08/24/22

Velocity and acceleration

Can an object have zero velocity and nonzero accelera- tion at the same time? please give examples.
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Physics

08/24/22

Free fall word problem
As a freely falling object speeds up, what is happening to its acceleration—does it increase, decrease, or stay the same? (a) Ignore air resistance. (b) Consider air resistance.
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Physics

08/24/22

Physics Word problem

Two cars emerge side by side from a tunnel. Car A is trav- eling with a speed of 60 km/h and has an acceleration of 40 km/h/min. Car B has a speed of 40 km/h and has an acceleration of 60 km/h/min.... more
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08/23/22

Tent pole question
A 2.3 m tent pole is supported by a 2.7 m rope anchored in the ground some distance from the foot of the pole. Find the angle between the ground and the rope, to the nearest degree. (3 marks)
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Physics

08/23/22

Eliot supplied 2000 calories of heat to 500 grams of lead at 25°C.

What is the final temperature of the lead? The specific heat capacity of lead is 0.031 cal/g°C.
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Physics

08/23/22

The heat required to raise 3kg of copper from 0°C to 10°C raises 1 kg of lead from 10°C to 100°C.

If the specific heat capacity of copper is 0.095 cal/g°C, find the specific heat capacity of lead.
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Physics

08/23/22

Elon took 300g of water and supplied 8000 joules of heat to it.

What is the change in temperature of the water? (Specific heat capacity of water is 4.2 /g°C^-1)
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Physics

08/23/22

John found that the temperature of her aluminium container of mass 500g fell from 50°C to 35°C.
Calculate the amount of heat lost by the container. The specific heat capacity of aluminium is 900]/Kg°C.
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Physics Chemistry

08/23/22

Physics & Chemistry Question...
Dear experts,Im having trouble answering the following question:How many calories (cal) does it take to bring 80liters of water from 20 ° C to 80 ° C?0 4800 kcal0 1.5 kcal0 1600 cal0 3200 kcal0... more
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Physics

08/22/22

Slope of a line
The coordinates of two points are required for the calculation of a slope of a line, please explain why those points should be spaced wide apart
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Physics

08/21/22

Physics (vector) Question

Dear experts,Im having an issue understanding the following Physics question...The vector product between two vectors of known intensity is maximum when:1) the scalar product between the same... more
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Physics

08/21/22

Physics 101 problem
The following formula estimates an average person’s lungcapacity V (in liters, where 1 L = 103 cm3): V = 4.1H - 0.018A - 2.7,where H and A are the person’s height (in meters) and age (in years),... more
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Physics

08/21/22

Word problem physics 101
Estimate how many days it would take to walk around the Earth, assuming 12 h walking per day at 4 km/h.
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Physics

08/21/22

Physics 101 word problem
Computer chips are etched on circular silicon 44. wafers of thickness 0.300 mm that are sliced from a solid cylindrical silicon crystal of length 25 cm. If each wafer canhold 400 chips, what is the... more
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Physics

08/21/22

Physics 101 word problem

A standard baseball has a circumference of approxi- mately 23 cm. If a baseball had the same mass per unit volume as a neutron or a proton, about what would its mass be?
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Physics

08/21/22

Multiply 3.079 * 102 m by 0.068 * 10–1 m, taking into account significant figures
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Physics

08/21/22

What is the percent uncertainty in the measurement 5.48 +/- 0.25m?
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Physics

08/21/22

Conversion ft squared to yd squared
To convert from ft2 to yd2, you should (a) multiply by 3.(b) multiply by 1/3.(c) multiply by 9.(d) multiply by 1/9.(e) multiply by 6.(f) multiply by 1/6.
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