Physics Answers

Which of these statements is (are) true?

1. An object can have zero acceleration and be at rest.

2. An object can have nonzero acceleration and be at rest.

3. An object can have zero acceleration and be in motion.

a) 1 only b) 1 and 3 c) 1 and 2 d) 1, 2, and 3

an ideal heat engine has an efficiency of 50% when its low temperature reserver is 25°C. it is desire to increase the efficiency to 35%. what change should be made in either (1) the temperature of the low reserver or (2) the temperature of the high reserver??

A military aircraft is flying horizontally at a speed of 500m/s, drops a missile at an enemy target when it is at a height of 132.5m above the ground level.calculate in kilometers, the value of the horizontal distance travelled by the missile before hitting the target.[g= 10m/s square]

To sterilize a 50.0-g glass babby bottle, we must raise its temperature from 22.0 degree celcius to 95.0 degree celcius . How much heat transfer is required?

Which of the following is NOT a condition for an object to be in static equilibrium?

a) the object isn't moving

b) the object is in translational equilibrium

c) the object is in rotational equilibrium

d) the object is at a constant velocity

An aeroplane takes off at an angle of 60 degree to the horizontal if the components of the velocity along the horizontal is 200 m/s what is the actual velocity? Also find the vertical components of its velocity

Determine the size of spherical balloon required to lift a payload of 1360 kg. The gas to be used is Helium at

101.3 Kpa and 23 0 C. The surrounding air is 101.3 KPa and 10 0 C.

A gold doubloon 6.1 cm in diameter and 2.0 mm thick is dropped over the side of a pirate sheep. When it comes to rest on the ocean floor at a depth of 770 m, how much has its volume changed?​

A wheel initially at 5 cycles per second decelerates and stops after completed 60 turns. What is the angular speed the wheel after completing 45 turns ?

Design a combinational circuit with four inputs— A, B, C, and D —and one output, F . F is to be equal to 1 when A = 1, provided that B = 0, or when B = 1, provided that either C or D is also equal to 1. Otherwise, the output is to be equal to 0. 1. Obtain the truth table of the circuit. 2. Simplify the output function. 3. Draw the logic diagram of the circuit, using NAND gates with a minimum number of ICs. 4. Construct the circuit and test it for proper operation by verifying the given conditions.