Other Physics Answers

6.A car traveling at 20 m/s goes around an unbanked curve in the road which has a radius of 122 m. The acceleration experienced by the car is ___m/s2. (Give your answer with the correct number of significant digits and do not include units)

7.An object traveling in a circle with a radius of 5.0 m has a frequency of 6.0 Hz. The speed of the object is ___x102 m/s. (Give your answer with the correct number of significant digits and do not include units)

8.If the centripetal acceleration on a stone being whirled in a circle at the end of a 1.75 m string is 350 m/s2, the frequency of rotation is ___Hz? (Give your answer with the correct number of significant digits and do not include units)

9.A 1000 kg car enters an unbanked curve of 80 m radius. If the coefficient of friction between the pavement and the car tires is 0.51, the maximum speed which the car can go around the curve is ___m/s. (Give your answer with the correct number of significant digits and do not include units)

1.True or False: When a ball is twirling at a uniform speed on the end of a string, the inward force is zero.

2.True or False: An object can be accelerating while maintaining a uniform (constant) speed.

3.If you were to reduce the radius of the arc through which you twirled a ball on a string by one-half, the size of the inward force (tension) in the string would be ___ as large

1/4 x

1/2 x

2 x

4 x

4.If you were to increase the mass of the ball by five times, the size of the inward force (tension) in the string would be ___ as large.

1/10 x

1/5 x

5 x

25x

5.The centripetal force acting on a 2.5 kg object whirling at a speed of 3.5 m/s in a horizontal circle of radius 0.80 m is: ___ N. (Give your answer with the correct number of significant digits and do not include units)

Suggest two reasons why the efficiency of this solar cell at producing electricity from sunlight is less than 100%.

Briefly describe, using some theories, how the energy form from the sun is converted into electrical energy.

A 15 m long wire carries a current of 6 A and is placed in a uniform magnetic field of 0.40 T. Solve for the magnitude and direction of the force on the wire when the wire is (a) perpendicular to the field, and (b) at 30° to the field. Draw your diagram indicating the current and magnetic field directions.

In a diagram , the value of q=1Nc. Find the magnitude of the net force on 6q charge and 4q charge

1. What is the weight of a 1 200 kg car?
2. A large dog has a weight of 245 N. What is the mass of the dog?

On Earth, the gravitational field intensity is 9.8 N/kg. Mercury has a mass of 3.28 x 10²³ kg and a radius of 2.57 x 10⁶ m. Calculate the gravitational field intensity on Mercury in N/kg.

A pool table has a mass of 600 kg. In an attempt to move it, Peter exerts an upwards force of 1000 N on the pool table. What is the normal force now acting on the pool table?